TIRMIDHI 3412:
from Muḥammad —
The Prophet said: “There are Mu’aqqibat, he who says them shall not be miserable. Glorify Allah at the end of every prayer thirty-three times, and praise him thirty-three times, and extol His greatness thirty-four times.”
الترمذي ٣٤١٢:
عن محمد —
عَنِ النَّبِيِّ ﷺ قَالَ مُعَقِّبَاتٌ لاَ يَخِيبُ قَائِلُهُنَّ يُسَبِّحُ اللَّهَ فِي دُبُرِ كُلِّ صَلاَةٍ ثَلاَثًا وَثَلاَثِينَ وَيَحْمَدُهُ ثَلاَثًا وَثَلاَثِينَ وَيُكَبِّرُهُ أَرْبَعًا وَثَلاَثِينَ