Sahih Muslim | Book 6 | Hadith Number 2548

Narrated by Salama b. Akwa'
Salama b. Akwa' reported: We, during the lifetime of the Messenger of Allah (may peace be upon him), in one month of Ramadan (observed fast according to our liking). He who wished to fast lasted and he who wished to break broke it and fed a needy person as an expiation 1544 till this verse was revealed: "He who witnesses among you the month (of Ramadan) he should observe fast during it" (ii. 184).