Sahih al-Bukhari 2469
Narrated Anas:
Allah's Messenger (ﷺ) took an oath that he would not go to his wives for one month as his foot had been 
sprained. He stayed in an upper room when `Umar went to him and said, "Have you divorced your 
wives?" He said, "No, but I have taken an oath that I would not go to them for one month." The 
Prophet stayed there for twenty-nine days, and then came down and went to his wives.
حَدَّثَنَا ابْنُ سَلاَمٍ، حَدَّثَنَا الْفَزَارِيُّ، عَنْ حُمَيْدٍ الطَّوِيلِ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ آلَى رَسُولُ اللَّهِ صلى الله عليه وسلم مِنْ نِسَائِهِ شَهْرًا، وَكَانَتِ انْفَكَّتْ قَدَمُهُ فَجَلَسَ فِي عِلِّيَّةٍ لَهُ، فَجَاءَ عُمَرُ، فَقَالَ أَطَلَّقْتَ نِسَاءَكَ قَالَ ‏
"‏ لاَ، وَلَكِنِّي آلَيْتُ مِنْهُنَّ شَهْرًا ‏"‏‏.‏ فَمَكُثَ تِسْعًا وَعِشْرِينَ، ثُمَّ نَزَلَ، فَدَخَلَ عَلَى نِسَائِهِ‏.‏