Sunan Abi Dawud 2166
Narrated Aisha, Ummul Mu'minin:
I and the Messenger of Allah (ﷺ) used to lie in one cloth at night while I was menstruating. If anything from me smeared him, he washed the same place (that was smeared), and did not wash beyond it. If anything from him smeared his clothe, he washed the same place and did not wash beyond that, and prayed with it (i.e. the clothe).
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ جَابِرِ بْنِ صُبْحٍ، قَالَ سَمِعْتُ خِلاَسًا الْهَجَرِيَّ، قَالَ سَمِعْتُ عَائِشَةَ، - رضى الله عنها - تَقُولُ كُنْتُ أَنَا وَرَسُولُ اللَّهِ، صلى الله عليه وسلم نَبِيتُ فِي الشِّعَارِ الْوَاحِدِ وَأَنَا حَائِضٌ طَامِثٌ فَإِنْ أَصَابَهُ مِنِّي شَىْءٌ غَسَلَ مَكَانَهُ وَلَمْ يَعْدُهُ وَإِنْ أَصَابَ - تَعْنِي ثَوْبَهُ - مِنْهُ شَىْءٌ غَسَلَ مَكَانَهُ وَلَمْ يَعْدُهُ وَصَلَّى فِيهِ ‏.‏