Acts 18:6 (WEB)
When they opposed him and blasphemed, he shook out his clothing and said to them, “Your blood be on your own heads! I am clean. From now on, I will go to the Gentiles!”
Catechism · 1
“Still less can we extend responsibility to other Jews of different times and places, based merely on the crowd's cry: "His blood be on us and on our children!", a formula for ratifying a judicial sentence.” — Catechism footnote: Mt 27:25; cf. Acts 5:28; 18:6.