Ye shall observe to do therefore as the Lord your God doth command you,.... Observe every precept, as to matter and manner, which the Lord has commanded, and that under a sense of the great obligations laid on them by him, in giving them freely so good a land to possess: you shall not turn to the right hand or to the left; but walk in the way of the commandments of God, and not depart from them at all, but follow the Lord in his own ways fully. The phrase is expressive of a strict and close attention to the word of God, without deviating from it in the least; for every sin, which is a transgression of some command of God or another, is a going out of the way that directs unto; see Isa 30:21.