Rav. Ovadia Yosef Shlita brings down that the hand of a Rav has Kedusha from writing his droshas and therefore it is customary to kiss his hand on the way out of Shul. It’s in the Halachot of Shabbat I don’t remember where exactly. It also mentions kissing your mother/father’s hand after the blessing of the children. The mother is especially important because Friday night is all about the Shabbos Queen etc.
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