The Massacre of the Innocents is in the Gospel of Matthew (2:16–18) in which Herod the Great, king of Judea, orders the execution of all male children who are two years old and under in the vicinity of Bethlehem.
The Gospel of Matthew tells how the Magi visit Jerusalem to seek guidance as to where the king of the Jews has been born; King Herod directs them to Bethlehem and asks them to return to him and report, but they are warned in a dream that Herod wishes to find the child and kill him, and do not do so. Matthew continues:
When Herod realised that he had been outwitted by the Magi, he was furious, and he gave orders to kill all the boys in Bethlehem and its vicinity who were two years old and under, in accordance with the time he had learned from the Magi.
— Matthew 2:16
We pray for all innoncent children who have been killed in times of war and peace.