This verse repeats almost word for word statements found elsewhere in the book (see 6.13). But the verb cleave to is used here for the first time. It means to maintain a close relationship with someone, to cling to them or stay close to them (also 11.22; 13.4; 30.20). It is the verb used of the relationship between husband and wife (Gen 2.24). Good News Translation has “be faithful to.” This is also possible.

By his name you shall swear: see 6.13.

Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .