Volume 9, Book 91, Number 353:
Narrated Ibn Mas’ud:
Allah’s Apostle said, “The (call for prayer) Adhan of Bilal should not stop anyone of you from tak –
ing his Suhur for he pronounces the Adhan in order that whoever among you is praying the night
prayer, may return (to eat his Suhur) and whoever among you is sleeping, may get up, for it is not
yet dawn (when it is like this).” (Yahya, the sub-narrator stretched his two index fingers side ways).