Istanbul, Turkey, Nov 29, 2025 / 11:20 am (CNA).

Pope Leo XIV marked the start of Advent on Saturday with an appeal for unity and peace, telling thousands gathered for Mass in Istanbul that Christians “journey as if on a bridge that connects earth to heaven,” keeping their eyes “fixed on both shores” until they are united “in the house of the Father.”

The pope celebrated Mass on Nov. 29 at the Volkswagen Arena, a large multipurpose venue within Istanbul’s Uniq cultural complex. The liturgy, held on the eve of the feast of St. Andrew, patron of Turkey, took place during the third day of his first international apostolic trip, which has brought him to Turkey and will soon continue on to Lebanon.

In his homily, the pope reflected on the beginning of Advent, saying it prepares believers “to experience anew at Christmas the mystery of Jesus, the Son of God, begotten, not made, consubstantial with the Father.” Drawing on the first reading from Isaiah (Is 2:1–5), he invited the faithful “to ascend the mountain of the Lord,” which he described as an image of divine light and peace.

Leo pointed to two key images in the reading. The first was the mountain “established as the highest of the mountains,” which he said reminds Christians that God’s gifts “are a gift not only for us, but for everyone.” He cited examples of evangelizing witness: St. Peter meeting Christ through St. Andrew’s enthusiasm, and St. Augustine coming to the faith through St. Ambrose. Recalling a line from St. John Chrysostom — “The miracle happens and passes, but the Christian life remains and continually edifies” — he urged the faithful to “keep watch” with prayer, charity, and spiritual vigilance.

The second image was the prophet’s vision of peace: “They shall beat their swords into plowshares… neither shall they learn war any more.” The pope said the message is especially urgent today, calling the Church to be a sign of reconciliation in a world marked by conflict.

Turning to the theme of bridges, Leo noted that the logo for his visit to Turkey features the Bosporus Bridge, which joins Asia and Europe. He said the image points to three essential “bridges of unity”: within the Catholic community, in relations with other Christians, and in dialogue with other religions.

The pope highlighted the four Catholic traditions present in Turkey — Latin, Armenian, Chaldean, and Syriac — calling them “a catholicity that unites.” Unity, he said, “needs care, attention, and maintenance.” Quoting Christ’s prayer “that they may all be one,” he appealed again for Christian unity and encouraged believers to be peacemakers.

The diversity of Turkey’s Catholic community was visible in the liturgy. A choir of about 200 members represented the country’s four rites. Scripture readings and prayer intentions were offered in Turkish, Aramaic, Syriac, English, Armenian, and Arabic, reflecting the multilingual and multicultural character of local Catholics.

On Sunday afternoon, the pope will depart Turkey for the second leg of his apostolic journey in Lebanon. Before leaving Istanbul, he is scheduled to participate in several ecumenical events in the morning.

The highlights of Pope Leo XIV's third day in Türkiye include a visit to Istanbul's Blue Mosque, an ecumenical meeting with Christian leaders, prayer with Patriarch Bartholomew, and Mass with Catholic faithful from across the country.

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The faithful present at the Mass celebrated by Pope Leo XIV at the Volkswagen Arena in Istanbul on Saturday share their excitement and express their belief that his visit is a message of peace and unity for all.

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ISTANBUL (CNS) -- Pope Leo XIV, like his two immediate predecessors, visited the so-called Blue Mosque in Turkey's capital; he spent about 20 minutes inside but did not appear to pause for prayer as Pope Benedict XVI and Pope Francis had done.

Instead, he listened to Askin Musa Tunca, the mosque's muezzin who calls people to prayer five times a day, explain the building, its construction and how Muslims pray. And the pope asked questions. 

Tunca told reporters afterward that the mosque is "the house of Allah -- it's not my house; it's not your house," and so he told Pope Leo he could pray if he wanted. "'That's OK,' he said, he wanted to see the mosque."

Reporters pressed Tunca, asking again if the pope prayed. "Maybe to himself, I don't know," he responded.

The Vatican press office said afterward that Pope Leo visited the mosque "in a spirit of reflection and attentive listening, with deep respect for the place and for the faith of those who gather there in prayer."

As is customary, Pope Leo removed his shoes in the courtyard before entering the mosque in white socks. 

Formally called the Sultan Ahmed Mosque, the Muslim house of prayer was complete in 1617 and is known as the Blue Mosque because of the more than 21,000 blue tiles that decorate its walls, arches and domes. The tiles come from Iznik, site of the ancient Nicaea, which Pope Leo had visited the day before.

Leaving the mosque, Pope Leo noted to Tunca that they were going through a doorway with a sign that said, "No exit." The muezzin replied that the sign was for tourists but, if the pope preferred, "you do not have to go out. You can stay here."

Pope Benedict XVI had visited the Blue Mosque in 2006, and Pope Francis toured it in 2015. Both had paused for a moment of silence facing the mihrab, which indicates the direction of the Islamic holy city of Mecca. St. John Paul II was the first pontiff to visit a mosque when he went to the Umayyad mosque in Damascus, Syria, in 2001. 

In late October Pope Leo had led Vatican celebrations of the 60th anniversary of Nostra Aetate, the Second Vatican Council's document on relations with other world religions. The bishops at Vatican II said Catholics have esteem for their Muslim brothers and sisters, who "adore the one God, living and subsisting in himself; merciful and all-powerful, the Creator of heaven and earth," and "they take pains to submit wholeheartedly to even his inscrutable decrees."
 

Presiding over Mass in Istanbul, Türkiye, Pope Leo XIV urges everyone to take time to reflect during the Advent season on the three bonds of unity we are all called to build: within the community, in ecumenical relations, and with members of different faiths.

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Pope Leo XIV and Ecumenical Patriarch Bartholomew I are joined by ecclesial leaders representing the vast majority of the Christian world for an ecumenical encounter to mark the 1,700th anniversary of the Council of Nicaea.

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During his Apostolic Journey to Türkiye, Pope Leo XIV joins the Ecumenical Patriarch for a prayer service at the Patriarchal Church of Saint George in Istanbul.

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Pope Leo XIV and Ecumenical Patriarch Bartholomew I sign a Joint Declaration in Istanbul reaffirming their commitment to the path toward full communion and forcefully rejecting any use of religion to justify violence.

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As the Church marks the First Sunday of Advent, Fr Luke Gregory reflects on why Advent is a supreme time for praying for reconciliation and world peace.

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On the morning of the third day of his Apostolic Journey to Türkiye, Pope Leo XIV visits the Sultan Ahmed Mosque, also known as the “Blue Mosque.”

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