عَنْ أَسْمَاءَ رَضِيَ اللَّهُ عَنْهَا أَنَّهَا كَانَتْ إِذَا أُتِيَتْ بِالْمَرْأَةِ لِتَدْعُوَ لَهَا صَبَّتِ الْمَاءَ بَيْنَهَا وَبَيْنَ جَيْبِهَا وَقَالَتْ إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَمَرَنَا أَنْ نُبَرِّدَهَا بِالْمَاءِ وَقَالَ إِنَّهَا مِنْ فَيْحِ جَهَنَّمَ
It is narrated from Sayyida Asma’ (may Allah be pleased with her) that when a woman was brought to her so that she might supplicate for relief from fever, she would pour water into the woman’s garment and would say that the Noble Prophet (peace and blessings be upon him) commanded us to cool fever with water, and he (peace and blessings be upon him) said: Verily, it is from the steam of Hell.