Deuteronomy 4:9
Only take heed to thyself, and keep thy soul diligently, lest thou forget the things which thine eyes have seen, and lest they depart from thy heart all the days of thy life: but teach them thy sons, and thy sons' sons;
Only take heed to thyself,.... To walk according to this law, and not swerve from it:
and keep thy soul diligently; from the transgressions and breaches of it:
lest thou forget the things which thine eyes have seen; either the statutes and judgments set before them, and the circumstances of the delivery of them; or the punishment inflicted on the breakers of them; or the favours bestowed on those that observed them:
and lest they depart from thy heart all the days of thy life; out of thy mind and memory, and have no place in thy affections, through a neglect and disuse of them:
but teach them thy sons, and thy sons' sons; their children and grandchildren, that they may be trained up in them in their youth, and so not depart from them when grown up, and in years; see Deuteronomy 6:7.