"When "Ali bin Abu Talib came to Basrah, he entered upon my father and said: "O Abu Muslim, will you not help me against these people?' He said: "Of course.' So he called a slave woman of his and said: "O slave woman, bring me my sword.' So she brought it, and he unsheathed it a span, and (I saw that) it was made of wood. He said: "My close friend and your cousin (ﷺ) advised me, if tribulation (Fitnah) arose among the Muslims, that I should take a sword of wood. If you wish I will go out with you.' He said: "I have no need of you or of your sword.'"
Reference: Sunan Ibn Majah 3960 In-book : Book 36, Hadith 35 English translation : Vol. 5, Book 36, Hadith 3960
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