This has been transmitted by Abu 'Asim and Hammad b. Mas'adah as transmitted by Ibn Bakr.
Sunan Abi Dawud Book 4, Hadith 3
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I remarked to 'Umar al-Khattab: Have you seen the shortening of the prayer by the people today while Allah has said: "If you fear that those who are infidels may afflict you", whereas those days are gone now? He replied: I have wondered about the same matter for which you wondered. So I mentioned this to the Messenger of Allah (ﷺ). He said: It is an act of charity which Allah has done to you, so accept his charity.
Sunan Abi Dawud Book 4, Hadith 2 Next Hadith → I asked Anas b. Malik about the shortening of the prayer (while travelling). He said: When the Messenger of Allah (ﷺ) went out on a journey of three miles or three farsakh (the narrator Shu'bah doubted), he used to pray two rak'ahs.
Sunan Abi Dawud Book 4, Hadith 4
Sunan Abi Dawud Book 4, Hadith 2 Next Hadith → I asked Anas b. Malik about the shortening of the prayer (while travelling). He said: When the Messenger of Allah (ﷺ) went out on a journey of three miles or three farsakh (the narrator Shu'bah doubted), he used to pray two rak'ahs.
Sunan Abi Dawud Book 4, Hadith 4