33 times
سُبْحَانَ اللَّهِ، وَالْحَمْدُ لِلَّهِ، وَاللَّهُ أَكْبَرُ (ثلاثاً وثلاثين) لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
Edition transliteration
Subhanal-lah walhamdu lillah, wallahu akbar (thirty-three times). (La ilaha illal-lahu wahdahu la shareeka lah, lahul-mulku walahul-hamd, wahuwa AAala kulli shayin qadeer.)
Meaning
How perfect Allah is, all praise is for Allah, and Allah is the greatest.(thirty-three times) (None has the right to be worshipped except Allah, alone, without partner, to Him belongs all sovereignty and praise and He is over all things omnipotent.)
Source and references
Hisn al-Muslim, entry 69.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗