Sahih al-Bukhari 5294Book 68, Hadith 43
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، حَدَّثَنَا سَلَمَةُ بْنُ عَلْقَمَةَ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ أَبُو الْقَاسِمِ صلى الله عليه وسلم " فِي الْجُمُعَةِ سَاعَةٌ لاَ يُوَافِقُهَا مُسْلِمٌ قَائِمٌ يُصَلِّي، فَسَأَلَ اللَّهَ خَيْرًا، إِلاَّ أَعْطَاهُ ". وَقَالَ بِيَدِهِ، وَوَضَعَ أَنْمَلَتَهُ عَلَى بَطْنِ الْوُسْطَى وَالْخِنْصَرِ. قُلْنَا يُزَهِّدُهَا.
Abul Qasim (the Prophet (ﷺ) ) said, "There is an hour (or a moment) of particular significance on Friday. If it happens that a Muslim is offering a prayer and invoking Allah for some good at that very moment, Allah will grant him his request." (The sub-narrator placed the top of his finger on the palm of the other hand between the middle finger and the little one.)