Analysis of information sources in references of the Wikipedia article "Dawah" in English language version.
The common version, however, is that B. Lihyan wanted to avenge the assassination of their chief at Muhammad's instigation, and bribed two clans of the tribe of Khuzaymah to say they wanted to become Muslims and ask Muhammad to send instructors.(online)
Then in Safar (which began July 13, 625), four months after Uhud, he sent out the men of Bi'r Ma'unah
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