There is no loss in prayer nor in salutation. Ahmad(b. Hanbal) said: This means, I think, that you do not salute nor you are saluted by others. The loss of a man in his prayer is that a man remains doubtful about it when he finishes it.
Reference: Sunan Abi Dawud 928 In-book : Book 2, Hadith 539 English translation : Book 2, Hadith 928
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