Sahih Muslim | Book 6 | Chapter 10

Narrated by 'Umar (Allah be pleased with him)
'Umar (Allah be pleased with him) reported Allah's Messenger (may peace be upon him) as saying: When the night approaches and the day retreats and the sun sinks down, then the observer of the fast should break it. Ibn Numair made no mention of the word "then".

Narrated by 'Abdullah b. Abi Aufa
'Abdullah b. Abi Aufa reported: We were with the Messenger of Allah (may peace be upon him) on a journey during the month of Ramadan. When the sun had sunk he said: So and so, get down (from your ride) and prepare the meal of parched barley for us. He said: Messenger of Allah, still (there is light of) day. He (the Holy Prophet) said: Get down and prepare meal of parched barley for us. So he got down and prepared the meal of parched barley and offered him, and the apostle of Allah (may peace be upon him) drank that (liquid meal). He then told with the gesture of his hand that when the sun sank from that side and the night appeared from that side, then the observer of the fast should break it.

Narrated by Ibn Abi Aufa (Allah be pleased with him)
Ibn Abi Aufa (Allah be pleased with him) reported: We were with the Messenger of Allah (may peace be upon him) on a journey. When the sun sank he said to a person: Get down and prepare barley meal for us. Upon this he said: Messenger of Allah, let there be dusk. (He the Holy Prophet) said: Get down and prepare barley meal for us. He (the person) said: There is still (the light of) day upon us. (But) he got down (in obedience to the command of the Holy Prophet) and prepared a barley meal for him and he (the Holy Prophet) drank that (liquid meal) and then said: When you see the night approaching from that side (west) (and he pointed towards the east with his hand), then the observer of the fast should break it.

Narrated by Abdullah b. Abi Aufa (Allah be pleased with him)
Abdullah b. Abi Aufa (Allah be pleased with him) reported: We travelled with the Messenger of Allah (may peace be upon him) as he had been observing fast. When the sun sank he said: So and so, get down and prepare barley meal for us. The rest of the hadith is the same.

Narrated by Ibn Abi Aufa
This hadith has been narrated on the authority of Ibn Abi Aufa (Allah be pleased with him) through another chain of transmitters (but with a sight alteration of words): In this hadith transmitted by one of the narrators (neither these words are found): During the month of Ramadan." nor his statement: "And the night prevails from that side (the eastern side)." (These words are found in the narration of)Hushaim only.