«يا أبا ذر! ألا أعلمك كلمات تقولهن تلحق من سبقك ولا يدركك إلا من أخذ بعملك؟ تكبر دبر كل صلاة ثلاثا وثلاثين وتسبح ثلاثا وثلاثين وتحمد ثلاثا وثلاثين وتختم بلا إله إلا الله وحده لا شريك له له الملك وله الحمد وهو على كل شيء قدير من قال ذلك غفرت له ذنوبه ولو كانت مثل زبد البحر»
The Prophet (peace and blessings be upon him) said:
"O Abu Dharr! Shall I not teach you some words which, if you say them, you will catch up with those who have gone ahead of you, and no one will overtake you except one who does the like of your deeds? After every prayer, say Allahu akbar thirty-three times, say Subhan Allah thirty-three times, say Al-hamdu lillah thirty-three times, and conclude with 'La ilaha illallahu wahdahu la sharika lahu, lahul-mulku wa lahul-hamdu wa huwa 'ala kulli shay'in qadir' (There is no true god except Allah, alone, without partner; to Him belongs the dominion, to Him belongs all praise, and He has power over all things). Whoever says that, his sins are forgiven, even if they are like the foam of the sea."
Hadith Referenceصحیح الجامع الصغیر / حرف الياء / 7821