Musannaf Ibn Abi Shaybah

Hazrat Zir bin Hubaish narrates that when it is the twenty-seventh night of Ramadan, perform ghusl (ritual bath). On this night, if any of you can delay your iftar (breaking of the fast) until suhoor (pre-dawn meal), then do so, and he should also break his fast on that day with lassi (a yogurt-based drink).