This is not a Bid’ah as it is a supplication which is said when a person is bidding another farewell.

Can you please explain me that sayin Allah Hafiz is a Bid’ah or not.

Supplications | March 20, 2014 6:05 pm
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Is this duah sahiha? When u see somebody with new cloth . Tublii wa Iukhlifu Allahu Ta’aala.
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Is it ok to say adhkar in the heart, without moving the lips?