Sayyiduna Uqbah bin Amir (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) forbade cauterization, and he used to dislike drinking hot water. When he applied kohl, he would apply it an odd number of times, and when he used stones (after relieving himself), he would use an odd number.
Ahmad and al-Tabarani recorded it, and its narrators are the narrators of the Sahih, except for Ibn Lahi'ah, and his hadith is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطب / 8361