ROME — Pope Leo XIV on Sunday rejected claims that God justifies war during a Palm Sunday Mass before tens of thousands of people in St. Peter’s Square.

With the U.S.-Israeli war on Iran entering its second month and Russia’s ongoing campaign in Ukraine, Leo dedicated his Palm Sunday homily to insist that God is the “king of peace” who rejects violence and comforts those who are oppressed.

“Brothers and sisters, this is our God: Jesus, King of Peace, who rejects war, whom no one can use to justify war,” Leo said. “He does not listen to the prayers of those who wage war, but rejects them.”

Leaders on all sides of the Iran war have used religion to justify their actions. U.S. officials, especially Defense Secretary Pete Hegseth, have invoked their Christian faith to cast the war as a Christian nation trying to vanquish its foes with military might.

Russia’s Orthodox Church, too, has justified Russia’s invasion of Ukraine as a “holy war” against a Western world it considers has fallen into evil.

Palm Sunday marks Jesus’ triumphant entrance into Jerusalem in the time leading up to his crucifixion, which Christians observe on Good Friday, and resurrection on Easter Sunday.

Sunday’s celebration began with a procession of cardinals, bishops, priests and laypeople walking into the square carrying olive branches and palm fronds, some intricately braided. They stopped at the central obelisk, where Leo delivered an opening prayer, and then processed toward the altar to begin the Mass.

When Holy Week opened last year, Pope Francis was still recovering at the Vatican after a five-week hospital stay for double pneumonia. He had delegated the liturgical celebrations to others, but rallied on Easter Sunday to greet the faithful from the loggia of St. Peter’s Square. Most poignantly, he then made what became his final popemobile loop around the piazza.

Francis died the following morning, Easter Monday, after suffering a stroke. His nurse, Massimiliano Strappetti, later told Vatican Media that Francis had told him: “Thank you for bringing me back to the square” for the final salute.

Leo is due to preside over this week’s liturgical appointments and is returning to tradition with the Holy Thursday feet-wash ceremony that commemorates Jesus’ Last Supper with his disciples.

During his 12-year pontificate, Francis famously celebrated the Holy Thursday ritual by traveling to Rome-area prisons and refugee centers to wash the feet of people most on society’s margins. His aim was to drive home the ritual’s message of service and humility, and he would frequently muse during his Holy Thursday homilies “Why them and not me?”

Francis’ gesture had been praised as a tangible evidence of his belief that the church must go to the peripheries to find those most in need of God’s love and mercy. But some critics bristled at the annual outings, especially since Francis would also wash the feet of Muslims and people of other faiths.

Leo, history’s first U.S.-born pope, is returning the Holy Thursday foot-wash tradition to the basilica of St. John Lateran, where popes performed it for decades. The Vatican hasn’t yet said who will participate, though Popes Benedict XVI and John Paul II normally washed the feet of 12 priests.

On Friday, Leo is due to preside over the Good Friday procession at Rome’s Colosseum commemorating Christ’s Passion and crucifixion. Saturday brings the late night Easter Vigil, during which Leo will baptize new Catholics, followed a few hours later by Easter Sunday when Christians commemorate the resurrection of Jesus.

Leo will celebrate Easter Sunday Mass in St. Peter’s Square and then deliver his Easter blessing from the loggia of the basilica.

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