Exodus 34:24-26

Complete Jewish Bible

²⁴ For I am going to expel nations ahead of you and expand your territory, and no one will even covet your land when you go up to appear before Adonai your God three times a year. ²⁵ You are not to offer the blood of my sacrifice with leavened bread, and the sacrifice of the feast of Pesach is not to be left until morning. ²⁶ You are to bring the best firstfruits of your land into the house of Adonai your God.

“You are not to boil a young goat in its mother’s milk.”