حَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ فَاطِمَةَ بِنْتِ الْمُنْذِرِ، أَنَّ أَسْمَاءَ بِنْتَ أَبِي بَكْرٍ، كَانَتْ إِذَا أُتِيَتْ بِالْمَرْأَةِ وَقَدْ حُمَّتْ تَدْعُو لَهَا أَخَذَتِ الْمَاءَ فَصَبَّتْهُ بَيْنَهَا وَبَيْنَ جَيْبِهَا وَقَالَتْ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَأْمُرُنَا أَنْ نُبْرِدَهَا بِالْمَاءِ ‏.‏

Yahya related to me from Malik from Hisham ibn Urwa from Fatimabint al-Mundhir that whenever a woman who had a fever, was brought toAsma bint Abi Bakr, she made dua for her and took water and poured itinside her collar. She said, "The Messenger of Allah, may Allah blesshim and grant him peace, ordered us to cool it with water." Translation Not Available

Book Ref: Muwatta Imam Malik Book 50 Hadith 1728
Web Ref:  Muwatta Imam Malik Book 50 Hadith 15