I don’t know if this is an actual mekor, but we find in the Chumash that when Leah Imeinu gave the name Gad, Rashi there says “Ba Mazel Tov” (Beraishis 30:11)
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I don’t know if this is an actual mekor, but we find in the Chumash that when Leah Imeinu gave the name Gad, Rashi there says “Ba Mazel Tov” (Beraishis 30:11)