John Gill Bible Commentary

Keep therefore the words of this covenant, and do them,.... To do which they were laid under great obligations, through the goodness of God to them, in giving them victory over the two kings, and delivering their countries into their hands, as well as by all the favours bestowed on them in the wilderness, where they were sufficiently supplied with food, drink, and raiment; all which is made use of as a motive and argument to engage them to observe and keep the covenant the Lord made with them: that ye may prosper in all that ye do: in all their occupations and businesses of life, in their manufactures and commerce, in the culture of their fields and vineyards, and in whatsoever they were employed in a lawful way; the word used has sometimes, the signification of acting wisely and prudently, as in Isa 52:13; hence the Septuagint version is, "that ye may understand all that ye do"; and so the Jerusalem Targum.