مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 453
Purification
Associating with one who is defiled, and what is permitted - Section 1
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا كَانَ جُنُبًا فَأَرَادَ أَنْ يَأْكُلَ أَوْ ينَام تَوَضَّأ وضوءه للصَّلَاة
‘Aisha said that when the Prophet (ﷺ) was defiled and wanted to eat or sleep, he performed the ablution prescribed for prayer. (Bukhari and Muslim)
Mishkat al-Masabih, 453مُتَّفَقٌ عَلَيْهِ (الألباني)