Muhammad ibn al-Muthanna and Abu Bakr ibn Khallad narrated to us, both saying: 'Abd al-A'la narrated to us, from Sa'id, from Abu Nadrah, from Abu Sa'id al-Khudri, may Allah be pleased with him, who said: The Messenger of Allah, peace and blessings be upon him, observed i'tikaf during the middle ten days of Ramadan, seeking Laylat al-Qadr before it was made clear to him. When those days passed, he ordered the tent to be dismantled, and it was taken down. Then it was made clear to him that it was in the last ten days, so he ordered the tent to be erected, and it was set up again. Then he came out to the people and said: "O people, Laylat al-Qadr was made clear to me, and I came out to inform you of it, but two men came disputing with each other, and Satan was with them, so I was made to forget it. So seek it in the last ten days of Ramadan. Seek it on the ninth, the seventh, and the fifth." He said: I said, "O Abu Sa'id, you are more knowledgeable of the counting than we are." He said: "Indeed, we are more entitled to that than you." He said: I said, "What is the ninth, the seventh, and the fifth?" He said: "When twenty-one have passed, the night that follows is the twenty-second, and it is the ninth. When twenty-three have passed, the night that follows is the seventh. When twenty-five have passed, the night that follows is the fifth." And Ibn Khallad said, in place of "disputing with each other," "quarreling with each other."