The Prophet (ﷺ) said: When any of you hears the summons to prayer while he has a vessel in his hand, he should not lay it down till he fulfils his need.
Sunan Abi Dawud Book 14, Hadith 38
← Previous Hadith When the verse "Until the white thread of dawn appear to you distinct from its black thread" was revealed, I took a white rope and a black rope, and placed them beneath my pillow ; and then I looked at them, byt they were not clear to me. So I mentioned it to the Messenger of Allah (ﷺ). He laughed and said: Your pillow is so broad and lengthy ; that is (i.e. means) night and day. The version of the narrator 'Uthman has: That is the blackness of night and whiteness of day.

Sunan Abi Dawud Book 14, Hadith 37 Next Hadith → The Prophet (ﷺ) as saying: When the night approaches from this side and the day retreats on that side, and the sun sets - according to the version of Musaddad - he who fasts has reached the time to break it.

Sunan Abi Dawud Book 14, Hadith 39