Sunan an-Nasa'i 886
It was narrated that Ibn Umar said:
"While we were praying with the Messenger of Allah (ﷺ), a man among the people said: 'Allahu Akbaru kabira, wal-hamdu Lillahi kathira, wa subhan-Allahi bukratan was asila (Allah is Most Great and much praise be to Allah and glorified be Allah at the beginning and end of the day).' The Messenger of Allah (ﷺ) said: 'Who is the one who said such and such?' A man among the people said: 'I did, O Messenger of Allah.' He said: ' I like it,' and he said words to the effect that the gates of the Heavens had been opened for it." Ibn Umar said: "I never stopped saying it since I heard the Messenger of Allah (ﷺ) say that."
أَخْبَرَنَا مُحَمَّدُ بْنُ شُجَاعٍ الْمَرُّوذِيُّ، قَالَ حَدَّثَنَا إِسْمَاعِيلُ، عَنْ حَجَّاجٍ، عَنْ أَبِي الزُّبَيْرِ، عَنْ عَوْنِ بْنِ عَبْدِ اللَّهِ، عَنِ ابْنِ عُمَرَ، قَالَ بَيْنَمَا نَحْنُ نُصَلِّي مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ رَجُلٌ مِنَ الْقَوْمِ اللَّهُ أَكْبَرُ كَبِيرًا وَالْحَمْدُ لِلَّهِ كَثِيرًا وَسُبْحَانَ اللَّهِ بُكْرَةً وَأَصِيلاً ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَنِ الْقَائِلُ كَلِمَةَ كَذَا وَكَذَا ‏"‏ ‏.‏ فَقَالَ رَجُلٌ مِنَ الْقَوْمِ أَنَا يَا رَسُولَ اللَّهِ ‏.‏ قَالَ ‏"‏ عَجِبْتُ لَهَا ‏"‏ ‏.‏ وَذَكَرَ كَلِمَةً مَعْنَاهَا ‏"‏ فُتِحَتْ لَهَا أَبْوَابُ السَّمَاءِ ‏"‏ ‏.‏ قَالَ ابْنُ عُمَرَ مَا تَرَكْتُهُ مُنْذُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُهُ ‏.‏