Narrator:Umm Sulaym
وَعَنْ أُمِّ سُلَيْمٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَأْتِيهَا فَيَقِيلُ عِنْدَهَا فَتَبْسُطُ نِطْعًا فَيَقِيلُ عَلَيْهِ وَكَانَ كَثِيرَ الْعَرَقِ فَكَانَتْ تَجْمَعُ عَرَقَهُ فَتَجْعَلُهُ فِي الطِّيبِ. فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «يَا أُمَّ سُلَيْمٍ مَا هَذَا؟» قَالَتْ: عَرَقُكَ نَجْعَلُهُ فِي طِيبِنَا وَهُوَ مِنْ أَطْيَبِ الطِّيبِ وَفِي رِوَايَةٍ قَالَتْ: يَا رَسُولَ اللَّهِ نَرْجُو بَرَكَتَهُ لِصِبْيَانِنَا قَالَ: «أصبت» . مُتَّفق عَلَيْهِ
Umm Sulaim told that the Prophet used to visit her and have a siesta in her house, and she would spread out a leather cloth on which he had his siesta. He sweated profusely, and she would collect his sweat and put it in perfume. The Prophet asked, "What is this, Umm Sulaim?" and she replied, "It is your sweat which we put in our perfume, and it is a perfume of the sweetest type." In a version she said, "Messenger of God, we hope for your blessing on our children," and he replied, "You are right." (Bukhari and Muslim.)
Cited in Mishkat al-Masabih (No. 5788).