Or HaChaim on Leviticus 22:3/אור החיים על ויקרא כ״ב:ג׳

1 אמר אלהם, "say to them, etc." Torat Kohanim write that the people addressed in this verse were the ones standing at Mount Sinai. The author tried to answer why the Torah added the apparently superfluous words אמר אלהם seeing that the verse is a continuation of chapter 21 and the opening verses of this chapter. The previous directives had been addressed to the priests, so that this chapter is merely a continuation. If, on the other hand, this chapter is addressed to the Israelites at large, these had not even been mentioned in any of the adjoining verses! It follows therefore that it was addressed to all the people who had stood at Mount Sinai, the time they had become G'd's bride, so to speak. When the Torah does not bother to mention to whom the speaker addresses Himself, we may assume that the speaker is G'd Himself and that He speaks about the whole people. It follows that the retribution threatened in this paragraph for desecrating the holy name of G'd applies to all the people who had heard the revelation at Mount Sinai. [the word אלהם is therefore equivalent to עלהם. Ed.] You may well ask that if this is so why does the Torah in all other instances mention that the Israelites are addressed by writng such formulae as דבר אל בני ישראל, or something similar instead of merely writing אמר אלהם? Our sages in Vayikra Rabbah 2,5 already answered this with a parable. A father had an only son and he always mentioned the fact that he was his son by saying to him: "eat my son, drink my son, etc. Similarly, G'd told Moses on an almost daily basis: 'Tell the Israelites, etc.' He mentions their name as a reminder of how fond He is of them." This kind of address is standard procedure in the Torah. Whenever the situation appears to allow for some additional message we endeavour to extract it from that text.