Deuteronomy 12:15

Thou mayest kill and eat flesh, to wit, for thy common use and food. In all thy gates, i.e. thy cities or dwellings. Whatsoever thy soul lusteth after; what you shall desire either for quantity or quality, provided always you observe the laws given you elsewhere about avoiding excess and uncleanness in the things you eat. Which he hath given thee, according to thy quality and estate; whereby he manifestly condemns those who profusely and riotously spend other men's money, and live at a rate which their consciences know to be much above their ability; which certainly is an ungodly and unrighteous, though too common, practice. The unclean, who is forbidden to eat of holy meats, Leviticus 7:20. May eat thereof, to wit, of any sort of creatures, even of those sorts which are offered to God in sacrifices, which are as free to your use as the roebuck and the hart, which were not accepted in sacrifice, Leviticus 22:19; yet were clean beasts, Deuteronomy 14:5; and therefore here is a tacit exception of unclean beasts.