Sunan an-Nasa'i 1354
سنن النسائي#1354Sahihأَخْبَرَنَا أَحْمَدُ بْنُ حَفْصِ بْنِ عَبْدِ اللَّهِ النَّيْسَابُورِيُّ، قَالَ حَدَّثَنِي أَبِي قَالَ، حَدَّثَنِي إِبْرَاهِيمُ، - يَعْنِي ابْنَ طَهْمَانَ - عَنِ الْحَجَّاجِ بْنِ الْحَجَّاجِ، عَنْ أَبِي الزُّبَيْرِ، عَنْ أَبِي عَلْقَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ سَبَّحَ فِي دُبُرِ صَلاَةِ الْغَدَاةِ مِائَةَ تَسْبِيحَةٍ وَهَلَّلَ مِائَةَ تَهْلِيلَةٍ غُفِرَتْ لَهُ ذُنُوبُهُ وَلَوْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ " .
It was narrated that Abu Hurairah said:"The Messenger of Allah (ﷺ) said: 'Whoever says the tasbih one hundred times following the morning prayer, and the tahlil one hundred times, he will be forgiven his sins even if they are like the foam of the sea
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 13:176