Recite Thirty Three Times After Every Salah

Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, “He who recites after every prayer: Subhan-Allah (Allah is free from imperfection) thirty-three times; Al-hamdu lillah (praise be to Allah) thirty-three times; Allahu Akbar (Allah is Greatest) thirty-three times; and completes the hundred with: La ilaha illallahu, wahdahu la sharika lahu, lahul-mulku wa lahul-hamdu, wa Huwa ‘ala kulli shai’in Qadir (there is no true god except Allah. He is One and He has no partner with Him. His is the sovereignty and His is the praise, and He is Omnipotent), will have all his sins pardoned even if they may be as large as the foam on the surface of the sea.”
وعنه عن رسول الله صلى الله عليه وسلم قال‏:‏ ‏”‏من سبح الله في دبر كل صلاة ثلاثًا وثلاثين، وحمد الله ثلاثًا وثلاثين، وكبر الله ثلاثًا وثلاثين، وقال تمام المائة‏:‏ لا إله إلا

الله وحده لا شريك له، له الملك وله الحمد، وهو على كل شيء قدير، غفرت خطاياه وإن كانت مثل زبد البحر” ‏(‏‏(‏رواه مسلم‏)‏‏)

[Muslim].
Sunnah.com reference  : Book 16, Hadith 12
Arabic/English book reference  : Book 16, Hadith 1419

Other similar hadiths

Narrated AbuHurayrah:

AbuDharr said: Prophet of Allah. The wealthy people have all the rewards; they pray as we pray; they fast as we fast; and they have surplus wealth which they give in charity; but we have no wealth which we may give in charity.

The Messenger of Allah (ﷺ) said: AbuDharr, should I not teach you phrases by which you acquire the rank of those who excel you? No one can acquire your rank except one who acts like you.

He said: Why not, Messenger of Allah? He said: Exalt Allah (say: Allah is Most Great) after each prayer thirty-three times; and praise Him (say: Praise be to Allah) thirty-three times; and glorify Him (say: Glory be to Allah) thirty-three times, and end it by saying, “There is no god but Allah alone, there is no partner, to Him belongs the Kingdom, to Him praise is due and He has power over everything”. His sins will be forgiven, even if they are like the foam of the sea.

لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَىْءٍ قَدِيرٌ

Reference  : Sunan Abi Dawud 1504
In-book reference  : Book 8, Hadith 89
English translation  : Book 8, Hadith 1499