The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1850
Abu Huraira reported Abu'l-Qasim (the kunya of the Holy Prophet) (may peace be upon him) as saying: There is a time on Friday at which no Muslim would stand and pray and beg Allah for what Is good but He would give it to him; and he pointed with his hand that (this time) is short and narrow.