New answers tagged social-convention
I remember hearing that the reason may be the Chazal that tells us that two angels accompany every Yid from shul on friday night and the double "gut shabbos" is meant to address both of these malachim (do not have a definite source)
The custom to respond to a greeting/wish-for-peace by giving some additional blessing - and expressing that additional blessing by 'doubling' the received wish - seems to go back at least to the times of the gemara: see Gitin 62a, where it talks about greeting gentiles working the land during shmita, and refers to "doubling" the "Shalom." (Apparently the ...
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