I intended to go (on expedition) to Khaybar. So I came to the Holy Prophet (ﷺ), greeted him and said: I am intending to go to Khaybar. He said: When you come to my agent, you should take from him fifteen wasqs (of dates). If he asks you for a sign, then place your hand on his collar-bone.
Reference: Sunan Abi Dawud 3632 In-book : Book 25, Hadith 62 English translation : Book 24, Hadith 3625
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