Whenever a woman suffering from fever was brought to Sayyidah Asma' bint Abi Bakr (may Allah be pleased with her), she would supplicate for her, take water and pour it between her and her side, and she would say: "The Messenger of Allah (peace and blessings be upon him) ordered her to cool it with water."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20705