Deuteronomy Chapter 4, Verse 9

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;- edit KJV text
9: Keep thyself therefore, and thy soul carefully. Forget not the words that thy eyes have seen, and let them not go out of thy heart all the days of thy life. Thou shalt teach them to thy sons and to thy grandsons,— edit Douay text
9: Take heed to thyself, and keep thy heart diligently: forget not any of the things, which thine eyes have seen, and let them not depart from thine heart all the days of thy life; and thou shalt teach thy sons and thy sons' sons,— edit LXX text