Elizabeth,

Matthew 15:1-11.

Jesus is criticized by the Pharisees for not washing his hands. Jesus defends himself by attacking them for not killing disobedient children according to the commandment: “He that curseth father or mother, let him die the death.” (See Ex.21:15, Lev.20:9, Dt.21:18-21).

Jesus tells them they are nullifying god’s law by accepting children who do not honor their parents here:

15:6 And honour not his father or his mother, he shall be free. Thus have ye made the commandment of God of none effect by your tradition.

Then Jesus calls them hypocrites, and says people with nice words but whose hearts are far from god are people whose words defile them.

At no point does Jesus bring up anything other than the Pharisees not killing their children in this section.