The Prophet ﷺ said to him, "Fast one day and you will have the reward of what remains."He said, "I am able to do more than that."The Prophet ﷺ said, "Fast two days and you will have the reward of what remains."He said, "I am able to do more than that."The Prophet ﷺ said, "Fast three days and you will have the reward of what remains."He said, "I am able to do more than that."The Prophet ﷺ said, "Fast four days and you will have the reward of what remains."He said, "I am able to do more than that."The Prophet ﷺ said, "Then fast the best fast in the sight of Allah, the fast of Dawud. He used to fast one day and break his fast the next."
حدثنا محمد بن جعفر حدثنا شعبة عن زياد بن فياض سمعت أبا عياض يحدث
أن النبي ﷺ قال له صم يوما ولك أجر ما بقي قال إني أطيق أكثر من ذلك قال صم يومين ولك أجر ما بقي قال إني أطيق أكثر من ذلك قال صم ثلاثة أيام ولك أجر ما بقي قال إني أطيق أكثر من ذلك قال صم أربعة أيام ولك أجر ما بقي قال إني أطيق أكثر من ذلك قال صم أفضل الصيام عند الله صم صوم داود كان يصوم يوما ويفطر يوما
Its isnad is sahih. It is a longer version of 6915, where we noted that Muslim and Nasai reported it through the route of Muhammad bin Jafar from Shubah. So here is the narration of Muhammad bin Jafar. It is one of the narrations of the story of Abdullah bin Amr regarding his diligence in worship, many of whose narrations we noted at 6477. We had failed to point out this isnad there.