It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that once the Noble Prophet (peace and blessings be upon him) left his pure wives (for a month). Hazrat Umar (may Allah be pleased with him) came to the service of the Noble Prophet (peace and blessings be upon him) at that time, and the Noble Prophet (peace and blessings be upon him) was sitting in a room on a mat, the marks of which had appeared on the blessed back of the Noble Prophet (peace and blessings be upon him). Seeing this, he said, "O Messenger of Allah, (Caesar and) Chosroes drink water in vessels of gold and silver, and you remain in this condition?" The Noble Prophet (peace and blessings be upon him) said, "Those people have been given good things quickly in this worldly life." Then the Noble Prophet (peace and blessings be upon him) said, "Sometimes the month is also of twenty-nine days, this much, this much," and the third time he folded his thumb.