Hadith 4:923
Hussain bin Ali narrated to us, from Za'idah, from Humayd, from Anas, that the Prophet (peace and blessings of Allah be upon him) would not pray until he had broken his fast, even if it were with a sip of water.
حدثنا حسين بن علي عن زائدة عن حميد عن أنس ان النبي صلى الله عليه وسلم كان لا يصلي حتى يفطر ولو بشربة من ماء