(13) Be circumspect.--Rather, take heed. The verb used is a very common one.

Make no mention of the name of other gods.--The Jewish commentators understand swearing by the name of other gods to be the thing here forbidden, and so the Vulg., "per nomen exterorum deorum non jurabitis." But the words used reach far beyond this. Contempt for the "gods of the nations" was to be shown by ignoring their very names. They were not to be spoken of, unless by preachers in the way of warning, or by historians when the facts of history could not be otherwise set forth. Moses himself mentions Baal (Numbers 22:41), Baal-peor (Numbers 25:3; Numbers 25:5), Chemosh (Numbers 21:29), and Moloch (Leviticus 20:2-5; Leviticus 23:21).

23:10-19 Every seventh year the land was to rest. They must not plough or sow it; what the earth produced of itself, should be eaten, and not laid up. This law seems to have been intended to teach dependence on Providence, and God's faithfulness in sending the larger increase while they kept his appointments. It was also typical of the heavenly rest, when all earthly labours, cares, and interests shall cease for ever. All respect to the gods of the heathen is strictly forbidden. Since idolatry was a sin to which the Israelites leaned, they must blot out the remembrance of the gods of the heathen. Solemn religious attendance on God, in the place which he should choose, is strictly required. They must come together before the Lord. What a good Master do we serve, who has made it our duty to rejoice before him! Let us devote with pleasure to the service of God that portion of our time which he requires, and count his sabbaths and ordinances to be a feast unto our souls. They were not to come empty-handed; so now, we must not come to worship God empty-hearted; our souls must be filled with holy desires toward him, and dedications of ourselves to him; for with such sacrifices God is well pleased.And in all things that I have said unto you, be circumspect,.... Or observe them, be careful to keep them punctually and constantly, even all that are delivered in this and the preceding chapters:

and make no mention of the name of other gods; neither call upon them, nor swear by them, nor make vows to them; and, as little as possible, ever utter their names, and never with pleasure and delight, and showing any honour of them, and reverence to them, but with the utmost detestation and abhorrence:

neither let it be heard out of thy mouth; not any of their names; the same thing in different words, the more to inculcate and impress the thing upon the mind, and to show with what vehemence and earnestness this is pressed.