Hadith on Fasting: There is Nothing Similar to Fasting in Reward

Abu Umamah reported: I said, “O Messenger of Allah, tell me a deed to do.” The Messenger of Allah, peace and blessings be upon him, said, “You must fast, for there is nothing equal to it.”

Source: Sunan al-Nasā’ī 2223

Grade: Sahih (authentic) according to Al-Albani