Sahih Bukhari

Narrated `Aisha:We poured medicine into the mouth of the Prophet (ﷺ) during his ailment. He said, ""Don't pour medicine into my mouth."" (We thought he said that) out of the aversion a patient usually has for medicines. When he improved and felt better he said, ""There is none of you but will be forced to drink medicine, except Al-`Abbas, for he did not witness your deed