Exodus 23:16, 19

You shall keep the Feast of Harvest, of the firstfruits of your labor, of what you sow in the field. You shall keep the Feast of Ingathering at the end of the year, when you gather in from the field the fruit of your labor.

“The best of the firstfruits of your ground you shall bring into the house of the LORD your God. “You shall not boil a young goat in its mother’s milk.