Addressing tens of thousands of people in St. Peter's Square on Palm Sunday, the celebration that opens the holiest week of the year in the lead-up to Easter for the world's 1.4 billion Catholics, the pontiff said that Jesus cannot be used to justify any wars.

"This is our God: Jesus, King of Peace, who rejects war, whom no one can use to justify war," Leo, the first US pope, told crowds in brilliant sunshine.

"[Jesus] does not listen to the prayers of those who wage war, but rejects them, saying: 'Even though you make many prayers, I will not listen: your hands are full of blood'”, he said, citing a Bible passage.

Leo did not specifically name any world leaders, but he has been ramping up criticism of the Iran war in recent weeks.

The pope, who is known for choosing his words carefully, has repeatedly called for an immediate ceasefire in the conflict and said on Monday that military airstrikes are indiscriminate and should be banned.

Some US officials have invoked Christian language to justify the joint US-Israeli strikes on Iran on Feb. 28 that initiated the expanding war.

US Defense Secretary Pete Hegseth, who has started leading Christian prayer services at the Pentagon, prayed at a service on Wednesday for "overwhelming violence of action against those who deserve no mercy".

Leo on Sunday referenced a Bible passage in which Jesus, about to be arrested ahead of his crucifixion, rebuked one of his followers for striking the person arresting him with a sword.

"[Jesus] did not arm himself, or defend himself, or fight any war," Leo said. "He revealed the gentle face of God, who always rejects violence. Rather than saving himself, he allowed himself to be nailed to the cross."

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