And Yahya ibn Yahya, Yahya ibn Ayyub, Qutaybah ibn Sa'id, and Ibn Hujr narrated to us — Yahya ibn Yahya said: "Informed us," while the others said: "Narrated to us" — Isma'il, who is Ibn Ja'far, from 'Abdullah ibn Dinar, that he heard Ibn 'Umar, may Allah be pleased with them both, say: The Messenger of Allah, peace and blessings be upon him, said: "The month is twenty-nine nights. Do not fast until you see it, and do not break your fast until you see it, unless it is obscured from you. And if it is obscured from you, then estimate it."