The Messenger of Allah ﷺ said, "There are phrases said in succession after every prayer whose reciter will not be disappointed. He glorifies Allah thirty-three times, praises Him thirty-three times, and magnifies Him thirty-four times."
أخبرنا محمد بن إسمعيل بن سمرة عن أسباط قال حدثنا عمرو بن قيس عن الحكم عن عبد الرحمن بن أبي ليلى
قال رسول الله ﷺ معقبات لا يخيب قائلهن يسبح الله في دبر كل صلاة ثلاثا وثلاثين ويحمده ثلاثا وثلاثين ويكبره أربعا وثلاثين
Reported by Muslim, in the chapter on Mosques, section on the desirability of remembrance after prayer and description of its manner, hadith no. 596/145, from the hadith of Asbat bin Muhammad, through the same chain, and it is also in Al-Kubra, hadith no. 1272.