ולמדתם אתם את בניכם לדבר בם
The above pasuk, which is included in the second parsha (paragraph) of Shema, appears to reiterate what was stated earlier (first paragraph): V’sheenantam l’vanecha v’dibarta bam, “And you shall instruct your children about them and you shall discuss them” (Devarim 6:7). On the surface, the second pasuk does not seem to contain any supplement. Ramban explains that in the first pasuk (V’sheenantam l’vanecha), the focus is on v’dibarta; you shall speak. Your speech at home, in the presence of family, should be in Torah. In the second pasuk, the emphasis is on l’dabeir bam, they, the children shall speak to…