Sahih Muslim Book 006, Hadith Number 2598.

Chapter : Forbiddance to observe perpetual fast and excellence of observing fast on alternate days.

'Abdullah b. Amr (Allah be pleased with them) reported that the Messenger of Allah (may peace be upon him) had said to him: Observe fast for a day and there would be reward for you for the rest (of the days). He said: I am capable of doing more than this. He then said: Observe fast for two days, and there would be reward for you for the rest (of the days). He said: I am capable of doing more than this. He (the Holy Prophet) said: Observe fast for three days and there would be reward for you for the rest of the days. He said: I am capable of doing more than this, whereupon he said: Observe fast for four days and there would be reward for you for the rest of the days. He said: I am capable of doing more than this. Thereupon he said: Then observe fast (which is the) best in the eye of Allah, the fast of David (peace be upon him); he used to observe fast one day and break on the other day.

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