C. F. Keil and Franz Delitzsch on Deuteronomy 6:2

Deu 6:2

The reason for communicating the law was to awaken the fear of God (cf. Deu 4:10; Deu 5:26), and, in fact, such fear of Jehovah as would show itself at all times in the observance of every commandment. “Thou and thy son:” this forms the subject to “thou mightest fear,” and is placed at the end for the sake of emphasis. The Hiphil האריך has not the transitive meaning, “to make long,” as in Deu 5:30, but the intransitive, to last long, as in Deu 5:16; Exo 20:12, etc.