Kathir bin ‘Abdullah bin ‘Amr bin ‘Awf Al-Muzani narrated from his father, that his grandfather said: “I heard the Messenger of Allah (ﷺ) say: ‘On Friday there is a time of the day during which no person asks Allah for something but He will give him what he asks for.’” It was said: ‘When is that time?’ He said: ‘When the Iqamah for prayer (is called), until the prayer ends.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ، حَدَّثَنَا كَثِيرُ بْنُ عَبْدِ اللَّهِ بْنِ عَمْرِو بْنِ عَوْفٍ الْمُزَنِيُّ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ: " فِي يَوْمِ الْجُمُعَةِ سَاعَةٌ مِنَ النَّهَارِ، لاَ يَسْأَلُ اللَّهَ فِيهَا الْعَبْدُ شَيْئًا إِلاَّ أُعْطِيَ سُؤْلَهُ " قِيلَ: أَىُّ سَاعَةٍ؟ قَالَ " حِينَ تُقَامُ الصَّلاَةُ إِلَى الاِنْصِرَافِ مِنْهَا " .
sunnah.com