It was narrated that Sulaiman bin Yasar said:

"I entered upon Umm Salamah and she told me that the Messenger of Allah ﷺ used to wake up in a state of Janabah without having had a wet dream, then he would fast." And she told him that she brought the Prophet ﷺ some grilled ribs and he ate from that, then he got up and prayed, and did not perform Wudu'.

أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ مُحَمَّدِ بْنِ يُوسُفَ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، قَالَ دَخَلْتُ عَلَى أُمِّ سَلَمَةَ فَحَدَّثَتْنِي أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُصْبِحُ جُنُبًا مِنْ غَيْرِ احْتِلاَمٍ ثُمَّ يَصُومُ . وَحَدَّثَنَا مَعَ هَذَا الْحَدِيثِ أَنَّهَا حَدَّثَتْهُ أَنَّهَا قَرَّبَتْ إِلَى النَّبِيِّ ﷺ جَنْبًا مَشْوِيًّا فَأَكَلَ مِنْهُ ثُمَّ قَامَ إِلَى الصَّلاَةِ وَلَمْ يَتَوَضَّأْ .