And thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up.

And thou shalt tell them to thy children, and thou shalt meditate upon them sitting in thy house, and walking on thy journey, sleeping and rising.

and thou shalt impress them on thy sons, and shalt talk of them when thou sittest in thy house, and when thou goest on the way, and when thou liest down, and when thou risest up.

and thou hast repeated them to thy sons, and spoken of them in thy sitting in thine house, and in thy walking in the way, and in thy lying down, and in thy rising up,

Teaching them to your children with all care, talking of them when you are at rest in your house or walking by the way, when you go to sleep and when you get up.

And you shall explain them to your sons. And you shall meditate upon them sitting in your house, and walking on a journey, when lying down and when rising up.

Et iterabis (vel, acues) ea filiis tuis, et disseres de ipsis sedens domi tuae, iter faciens, jacens in lecto, et surgens.

Thou shalt teach them diligently - שננתם shinnantam, from שנן shanan, to repeat, iterate, or do a thing again and again; hence to whet or sharpen any instrument, which is done by reiterated friction or grinding. We see here the spirit of this Divine injunction. God's testimonies must be taught to our children, and the utmost diligence must be used to make them understand them. This is a most difficult task; and it requires much patience, much prudence, much judgment, and much piety in the parents, to enable them to do this good, this most important work, in the best and most effectual manner. See at the end of this chapter, Deuteronomy 6:25 (note).
And shalt talk of them when thou sittest in thine house - Thou shalt have religion at home, as well as in the temple and tabernacle.
And when thou walkest by the way - Thou shalt be religious abroad as well as at home, and not be ashamed to own God wheresoever thou art.
When thou liest down, and when thou risest up - Thou shalt begin and end the day with God, and thus religion will be the great business of thy life. O how good are these sayings, but how little regarded!

And thou shalt (c) teach them diligently to thy children, and shalt talk of them when thou sittest in thy house, and when thou walkest by the way, and when thou liest down, and when thou risest up. (teach: Hebrews. whet, or, sharpen)
(c) Some read, "You shall whet them upon your children": that is, that they may imprint them more deeply in their memory.

And thou shall teach them diligently unto thy children,.... Care and diligence are to be used, and pains taken, to instruct children, as soon as they are capable, in the knowledge of God, and of his commandments; that they are to love him, fear him, serve, and worship him; this is to bring them up in the nurture and admonition of the Lord, Ephesians 6:4, it may be rendered "thou shalt whet or sharpen them" (s), the words or commandments; it is expressive of diligence and industry in teaching, by frequent repetition of things, by inculcating them continually into their minds, endeavouring to imprint them there, that they may be sharp, ready, and expert in them:
and shalt talk of them when thou sittest in thine house; at the time of meals, or at leisure hours, or even when employed in any business in the house which will admit of it; every opportunity should be taken to instil the knowledge of divine things into their tender minds:
and when thou walkest by the way; in a journey, and any of his children with him; or for diversion, in the garden, field, or vineyard; occasion may be taken on sight of any of the works of creation to lead into a discourse concerning God, his nature, perfections, and works, and the obligations his creatures lie under to love, fear, and serve him: and when thou liest down, and when thou risest up; at the time of going to bed, and rising from it; which, as they are seasons of prayer to God, may be improved in instruction of children.
(s) "et acues ea", Vatablus, Piscator.

Teach them diligently - Hebrews. whet, or sharpen them, so as they may pierce deep into their hearts. This metaphor signifies the manner of instructing them, that it is to be done diligently, earnestly, frequently, discreetly.