Narrated Abu Hurairah (radiAllahu anhu): Allah’s Messenger (salAllahu alayhi wasalam) talked about Friday and said:
'There is an hour on Friday and if a Muslim gets it while offering Salat (prayer) and asks something from Allah (Subhanahu wa Ta'ala), then Allah (Subhanahu wa Ta'ala) will definitely meet his demand.' And he (the Prophet (salAllahu alayhi wasalam) pointed out the shortness of that particular time with his hands.
[Sahih al-Bukhari]