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: Heb. 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.