Exodus 23:18

16And the feast of harvest, the first fruits of your labors, which you sow in the field; and the feast of ingathering, at the end of the year, when you gather in your labors out of the field.

17Three times in the year all your males shall appear before the Lord GOD.

18“You shall not offer the blood of my sacrifice with leavened bread. The fat of my feast shall not remain all night until the morning.

19You shall bring the first of the first fruits of your ground into the house of the LORD your God. “You shall not boil a young goat in its mother’s milk.

20“Behold, I send an angel before you, to keep you by the way, and to bring you into the place which I have prepared.