Medicine

Narrated Abu Said Al-Khudri (Radi-Allahu 'anhu):

A man came to the Prophet (Sallallahu 'Alaihi Wa Sallam) and said, "My
brother has some abdominal trouble." The Prophet (Sallallahu 'Alaihi Wa
Sallam) said to him "Let him drink honey." The man came for the second time
and the Prophet (Sallallahu 'Alaihi Wa Sallam) said to him, "Let him drink
honey." He came for the third time and the Prophet (Sallallahu 'Alaihi Wa
Sallam) said, "Let him drink honey." He returned again and said, "I have
done that." The Prophet (Sallallahu 'Alaihi Wa Sallam) then said, "Allah
has said the truth, but your brother's abdomen has told a lie. Let him
drink honey." So he made him drink honey and he was cured.

Bukhari Vol. 7 : No. 588