Sahih Muslim | Book 6 | Hadith Number 2415

Narrated by Zaid b. Thabit (Allah be pleased with him)
Zaid b. Thabit (Allah be pleased with him) said: We took meal shortly before dawn along with the Messenger of Allah (may peace be upon him). We then stood up for prayer. I said: How much span of time was there between the two (acts, i.e. taking of Sahri and observing of prayer)? He said (a span of reciting) fifty verses.