Whoever lies with an animal shall surely be put to death (Ex.22:19).
God made us to “be fruitful and multiply, and fill the earth, and subdue it; and rule over the fish of the sea and over the birds of the sky and over every living thing that moves on the earth” (Gen.1:28). Biblical reproduction necessitates sexual intercourse, within marriage.
Bestiality represents a reversal of this. It puts us amongst the animals we were supposed to be differentiated from. But as servants of God, we are not given the luxury of reversing God’s plan for us by living like animals. We have meaning, dignity and purpose, living unto God.
Bestiality was one of the sins God identified amongst the Canaanites. It wasn’t just that Israel was given the land. They were given the land, partially because of the disgusting practices prevalent there.
the land has become defiled, therefore I have brought its punishment upon it, so the land has spewed out its inhabitants. But as for you, you are to keep My statutes and My judgments and shall not do any of these abominations, neither the native, nor the alien who sojourns among you…(Lev.18:25-26).
Turning to depravity is common for those people and cultures that do not know God. The rejection of God meant historically that men “worshipped and served the creature rather than the Creator…” (Ro.1:25). Bestiality represents a form of this.
But God’s people are to behave differently. As servants of Christ, we are to keep His statutes and judgments.