Majma al-Zawaid — Hadith 7831

Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) kept away from his wives. Shu'bah says: I think the words in the narration are: he kept away for one month. Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) was at that time in an upper room on a mat, and the mark of the mat was on his back. Sayyiduna Umar (may Allah be pleased with him) said, "O Messenger of Allah! The Kisras drink from vessels of gold and silver, and this is your condition." The Prophet (peace and blessings be upon him) said, "Their good things have been given to them in the life of this world." Then the Prophet (peace and blessings be upon him) said, "The month is this much and this much," meaning it is sometimes of twenty-nine days as well. The third time, the Prophet (peace and blessings be upon him) folded down his thumb.
Ahmad recorded it. Its chain contains a narrator, Dawud bin Farahij, whom Ibn Hibban declared thiqah (trustworthy), while Yahya bin Ma'in and others called him da'if (weak).