Musar para sa Exodo 2:20

This also helps explain Yitro's question "ואיו, למה זה עזבתן את האיש" (Exodus 2,20) "where is he, why did you abandon the man?" The sequence should have been , למה זה עזבתן את האיש, ואיו, "why did you abandon the man, and where is he?" Then the letter ו would be justified as a letter denoting something additional. Yitro was not clear whether he should understand the words איש מצרי literally, i.e. an Egyptian, or whether he should read a more profound meaning into it as we have just described. Therefore, he said "call him so he can eat bread." These words would be appropriate both if the man was indeed an Egyptian in which case he deserved to be rewarded at least with a meal. If, on the other hand, איש מצרי meant what we have just described, then the words "call him and he shall eat bread" is a euphemism for offering Moses one of Yitro's daughters' hand in marriage, since clearly one of them was meant to become Moses' wife. This is why he said ואיו, the letter ו both at the beginning and at the end of the word אי "where?" That letter could then be applied to either possibility. It would then be a reminder of G–d's original question "אי" "where is your brother Abel?" (Genesis 4,9) Another possibility is the one mentioned by the Zohar, that the letter ו is symbolic of the sign, אות that G–d gave Cain, i.e. a letter from the holy Torah, so that no one who came across him would kill him as a murderer. (Rosenberg Montreal edition page 42)