Joshua 23:7 - Joseph Benson’s Commentary on the Old and New Testaments

That ye come not among those nations That ye avoid all familiar converse and contracts, but especially marriage, with them. Neither mention the name of their gods To wit, unnecessarily and familiarly, lest the mention of them should lead to discourse about them, and so by degrees bring them to the approbation and worship of them. Nor cause to swear by them Not to require or even admit a Gentile to swear by his god, as was usual, especially in leagues and contracts; for this would have been to suppose that these imaginary deities were conscious of men's thoughts, and had power to punish those who were guilty of perjury. And the forbidding this was also to secure them against making leagues and covenants with the Gentiles, which they would not have considered as binding without an oath. It is to be lamented that, among Christians, the names of the heathen gods are so commonly used, especially in poems. Let those names, which have been set up in rivalship with God, be for ever loathed and lost. Nor bow Neither give them any inward reverence, nor outward adoration. Here is an observable gradation, whereby he shows the progress which sin usually makes, and what need there is to look to the beginnings of it; forasmuch as a civil and common conversation with their persons was likely to bring them, and indeed did actually bring them, by insensible steps, to the worship of their gods. It is no wonder, therefore, if some things, not simply and in themselves evil, be forbidden by God, as here the naming of false gods is, because they are occasions and introductions to evil.