It was narrated from 'Abdul-Jabbar bin Wa'il that :

his father said: "I prayed with the Prophet (ﷺ) and a man said: 'Alhamdu lillahi hamdan kathiran tayyiban mubarakan fihi (Praise is to Allah, much, good and blessed praise).' When the Prophet (ﷺ) finished praying, he said: 'Who said that?' The man said: 'It was me, but I did not mean anything but good.' He said: 'The gates of heaven were opened because of it and nothing prevented it from reaching the Throne.'"

حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا إِسْرَائِيلُ، عَنْ أَبِي إِسْحَاقَ، عَنْ عَبْدِ الْجَبَّارِ بْنِ وَائِلٍ، عَنْ أَبِيهِ، قَالَ صَلَّيْتُ مَعَ النَّبِيِّ ـ صلى الله عليه وسلم ـ فَقَالَ رَجُلٌ الْحَمْدُ لِلَّهِ حَمْدًا كَثِيرًا طَيِّبًا مُبَارَكًا فِيهِ ‏.‏ فَلَمَّا صَلَّى النَّبِيُّ ـ صلى الله عليه وسلم ـ قَالَ ‏"‏ مَنْ ذَا الَّذِي قَالَ هَذَا ‏"‏ ‏.‏ قَالَ الرَّجُلُ أَنَا وَمَا أَرَدْتُ إِلاَّ الْخَيْرَ ‏.‏ فَقَالَ ‏"‏ لَقَدْ فُتِحَتْ لَهَا أَبْوَابُ السَّمَاءِ فَمَا نَهْنَهَهَا شَىْءٌ دُونَ الْعَرْشِ ‏"‏ ‏.‏