Barnes New Testament Notes

Verse 16. Because it is written, Be ye holy; for I am holy. Le 11:44. This command was addressed at first to the Israelites, but it is with equal propriety addressed to Christians, as the professed people of compared. The foundation of the command is, that they professed to be his people, and that as his people they ought to be like their God. See Barnes "Mic 4:5".

It is a great truth, that men everywhere will imitate the God whom they worship. They will form their character in accordance with his. They will regard what he does as right. They will attempt to rise no higher in virtue than the God whom they adore, and they will practise freely what he is supposed to do or approve. Hence, by knowing what are the characteristics of the gods which are worshipped by any people, we may form a correct estimate of the character of the people themselves; and hence, as the God who is the object of the Christian's worship is perfectly holy, the character of his worshippers should also be holy. And hence, also, we may see that the tendency of true religion is to make men pure. As the worship of the impure gods of the heathen moulds the character of the worshippers into their image, so the worship of Jehovah moulds the character of his professed friends into his image, and they become like him.

{e} "written" Le 11:44