Sahih al-Bukhari 6400
Narrated Abu Huraira:
Abu-l-Qasim (the Prophet) said, "On Friday there is a particular time. If a Muslim happens to be 
praying and invoking Allah for something good during that time, Allah will surely fulfill his request." 
The Prophet (ﷺ) pointed out with his hand. We thought that he wanted to illustrate how short that time 
was.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا أَيُّوبُ، عَنْ مُحَمَّدٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ قَالَ أَبُو الْقَاسِمِ صلى الله عليه وسلم ‏
"‏ فِي الْجُمُعَةِ سَاعَةٌ لاَ يُوَافِقُهَا مُسْلِمٌ وَهْوَ قَائِمٌ يُصَلِّي يَسْأَلُ خَيْرًا إِلاَّ أَعْطَاهُ ‏"‏‏.‏ وَقَالَ بِيَدِهِ قُلْنَا يُقَلِّلُهَا يُزَهِّدُهَا‏.‏