We used to salute the Messenger of Allah (ﷺ) while he was engaged in prayer and he would respond to our salutation, but when we returned from the Negas, we saluted him and he did not respond to us. He said : Prayer demands one's whole attention.
Reference: Sunan Abi Dawud 923 In-book : Book 2, Hadith 534 English translation : Book 2, Hadith 923
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