A time on Friday..

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Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (SAW) said while talking about the merits of Friday, "There is a time on Friday at which a Muslim, while he (or she) is performing Salat and is supplicating, will be granted whatever he (or she) is supplicating for." And he (SAW) pointed with his hand to indicate that this period of time is very short. 

[Al-Bukhari and Muslim].