"I bear witness that I heard Ibn 'Umar asking about Al-Khibr (the agreement to Al-Mukhabarah) and he said: 'We did not see anything wrong with that, until Ibn Khadij told us earlier that he heard the Messenger of Allah forbidding Al-Khibr.'" Hammad bin Zaid was in accord with the two of them.
Reference: Sunan an-Nasa'i 3918 In-book : Book 35b, Hadith 62 English translation : Vol. 4, Book 35, Hadith 3949
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