"War calls for war, violence calls for violence".
At least 2,400 other Palestinians were wounded in what was the bloodiest day of the Israeli-Palestinian conflict since the 2014 Gaza war.
The conflict coincided with the United States' inauguration of its first embassy in Jerusalem, a controversial move, which Palestinians have taken as US -backing of Israeli control of the city.
Francis, who visited Israel and Palestinian territories in 2014, asked both sides and the global community to redouble efforts "so that dialogue, justice and peace prevail".
Israel has come under mounting global pressure after its forces opened fire on the Gaza border on Monday, killing 60 protesters who had massed alongside the fence to protest as the United States moved its embassy from Tel Aviv to Jerusalem. He also led Catholics in praying a Hail Mary to ask for the intercession of Mary, Queen of Peace.
Parents and godparents must make sure they "feed the flame of baptismal grace in their little ones, helping them persevere in the faith", the pope said May 16 at his weekly general audience.
If we are clothed in Christ, St Paul reminded the early believers in his letter to the Colossians, we must take on the virtues of "compassion, kindness, humility, gentleness and patience".
The sacrament of Baptism, the Pope said, concludes with the Our Father, as those who are newly baptised learn to call God "Father" as they receive the fullness of his Holy Spirit.
Just as the Easter candle gives light to all our individual candles, so the love of the Risen Lord inflames the hearts of all the baptised.
"I was in Ausonia in the year '59". Christian education, he said, is a right of each child so that they can gradually come to know the plan of God for them.
However, the Chilean media have reported that Cardinal Francisco Javier Errazuriz Ossa, retired archbishop of Santiago and a member of Pope Francis' global Council of Cardinals, will not attend.