Ibn 'Umar said that al-Agharr (who was a man from Muzayna and had been a Companion of the Prophet) was owed some measures of dates by a man from the Banu 'Amr ibn 'Awf who came to him many times. He said, "I went to the Prophet (ﷺ) and he sent Abu Bakr as-Siddiq with me." He continues, "Everyone we met greeted us. Abu Bakr said, 'Don't you know that when people give the greeting before us, they have the reward? Give the greeting before them and you will have the reward.'"
Reference: Al-Adab Al-Mufrad 984 In-book : Book 42, Hadith 20 English translation : Book 42, Hadith 984
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