John Calvin on Leviticus 18:26-30

26. Ye shall therefore keep my statutes He here contrasts His Law with the abominations of the Gentiles. The exhibition of His severity, which He had referred to, might indeed have sufficed for the instruction of His people; but in order to influence them more strongly, He at the same time adduces the way pointed out to them in the Law, which would not suffer them to go astray, if only they refused not to follow God. For that the Gentiles, who were destitute of light, should have been drawn aside in every direction was not surprising; but whilst they thus proved their blindness, it behooved true believers, on the contrary, to testify that they were not children of darkness, but of light. And to this Paul seems to allude, when he exhorts believers not to walk, like the Gentiles, “in the vanity of their mind.” (Ephesians 4:17.) On this account God not only commends to them His precepts and statutes, but also His ordinances (custodias,) because He had omitted nothing in the Law which would be useful for the direction of men’s lives. The sum is, that unless they order themselves constantly by the doctrine which enlightens them, the same destruction awaited them also which was about to overwhelm the (Canaanitish) nations.

Leviticus 20

Leviticus 20:13, 15, 16

13. If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them.

13. Quicunque coierit cum masculo coitu mulieris, abominationem fecerunt ambo: morte morientur, sanguis eorum super eos.

15. And if a man lie with a beast, he shall surely be put to death; and ye shall slay the beast.

15. Si quis intulerit coitum suum in brutum, moriendo morietur, et jumentum occidetis.

16. And if a woman approach unto any beast, and lie down thereto, thou shalt kill the woman and the beast: they shall surely be put to death; their blood shall be upon them.

16. Si mulier accesserit ad unum animal ad coeundum cum eo, occides mulierem et animal, moriendo morientur, sanguis eorum super eos.