Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) says: We had not gone beyond the conquest of Khaybar when we entered a field of greens, and the people were hungry, so we ate a lot of it. Then we went to the mosque, and when the Messenger of Allah (peace and blessings be upon him) perceived the smell, he said: Whoever has eaten from this foul (unpleasant) tree should not come near us in the mosque. The people began to say: It has become forbidden, it has become forbidden. When this news reached the Messenger of Allah (peace and blessings be upon him), he said: O people! I have no authority to make unlawful what Allah has made lawful. In reality, it is a tree whose smell I dislike.