What did the Prophet Muhammad (saw) say about Bilal calling (or pronouncing) the Adhan while people are taking Suhur-meals?
      Narrated 'Abdullah bin Mas'ud:                          The Prophet said, "The call (or the Adhan) of Bila should not stop you     from taking the Suhur-meals for Bilal calls (or pronounces the Adhan)      so that the one who is offering the night prayer should take a rest,      and he does not indicate the daybreak or dawn." The narrator, Yazid,      described (how dawn breaks) by stretching out his hands and then      separating them wide apart.