Deuteronomy 14:21-23

Amplified Bible

²¹“You shall not eat anything that dies on its own. You may give it to the stranger (resident alien, foreigner) who is in your [city] gates, so that he may eat it, or you may sell it to a foreigner [since they are not under God’s law], but you are a people holy (set apart) to the Lord your God. You shall not ^[a]boil a young goat or a lamb in its mother’s milk.

²²“Every year you shall certainly tithe [a tenth] of all the yield of your seed which is produced by your field. ²³^[b]You shall eat the tithe (tenth) of your grain, your new wine, your oil, and the firstborn of your herd and your flock before the Lord your God in the place where He chooses to establish His Name (Presence), so that you may learn to fear [and worship] the Lord your God [with awe-filled reverence and profound respect] always.

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Footnotes

Deuteronomy 14:21 This may refer to an ancient Canaanite fertility rite, though another possibility is that it is an affront to the Creator to kill an animal with the substance that was intended to nourish it. In any case, the rabbis later extended the law to prohibit the consumption of boiled meat upon which a drop of milk had fallen, if the milk imparted any flavor to the meat. Subsequent Jewish law has forbidden the serving of meat and dairy products together.
Deuteronomy 14:23 This seems to refer to a communal meal which was part of worship, directed by the priests. Elsewhere, the tithe is designated for the priests in compensation for their services, and for the needy (Num 18:21; Deut 26:12).