Leviticus 18:23

18:23 You must not have sexual intercourse ¹  with any animal to become defiled with it, and a woman must not stand before an animal to have sexual intercourse with it; ²  it is a perversion. ³ 

Exodus 22:19

22:19 “Whoever has sexual relations ⁴  with a beast must surely be put to death.

Deuteronomy 27:21

27:21 ‘Cursed is the one who commits bestiality.’ ⁵  Then all the people will say, ‘Amen!’

[18:23]  ¹ tn See the note on v. 20 above.

[18:23]  ² tn Heb “to copulate with it” (cf. Lev 20:16).

[18:23]  ³ tn The Hebrew term תֶּבֶל (tevel, “perversion”) derives from the verb “to mix; to confuse” and therefore refers to illegitimate mixtures of species or violation of the natural order of things.

[22:19]  ⁴ tn Heb “lies with.”

[27:21]  ⁵ tn Heb “lies with any animal” (so NASB, NRSV). “To lie with” is a Hebrew euphemism for having sexual relations with someone (or in this case, some animal).