Musnad Ahmad 33:638

Musa narrated to us, Ibn Lahi'ah narrated to us, from Abu al-Zubayr, who said: I asked Jabir about a man who intends to fast while the vessel is in his hand to drink from it, and then he hears the call (to prayer). Jabir said: We used to be told that the Prophet, peace and blessings of Allah be upon him, said: "Let him drink."