Mukhtasar Muslim

Sayyiduna Samurah bin Jundub (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: Do not let Bilal’s (may Allah be pleased with him) call to prayer and the long whiteness in the sky deceive you regarding suhoor, until it spreads out like this. And (the narrator of the hadith) Hammad spread his hands out to the sides in this manner.