While bowing in prayer

سُبْـحانَ رَبِّـيَ الْعَظـيم (ثلاث مرات)

Glory to my Lord the Exalted (three times in Arabic)

Abu Dawud, Ibn Majah, An-Nasa'i, At-Tirmidhi, and Ahmad. See Al-Albani's Sahih At-Tirmidhi 1/83.

سُبْـحانَكَ اللّهُـمَّ رَبَّـنا وَبِحَـمْدِك ، اللّهُـمَّ اغْفِـرْ لي

Glory is to You , O Allah , our Lord , and praise is Yours . O Allah , forgive me.

Al-Bukhari 1/99, Muslim 1/350.

سُبـّوحٌ قُـدّْوس ، رَبُّ الملائِكَـةِ وَالـرُّوح

Glory (to You) , Most Holy (are You) , Lord of the angels and the Spirit.

Muslim 1/353, Abu Dawud 1/230.

اللّهُـمَّ لَكَ رَكَـعْتُ وَبِكَ آمَـنْت، ولَكَ أَسْلَـمْت ، خَشَـعَ لَكَ سَمْـعي، وَبَصَـري ، وَمُخِّـي، وَعَظْمـي، وَعَصَـبي ، وَما استَقَـلَّ بِهِ قَدَمي

O Allah , to You I bow (in prayer) and in You I believe and to You I have submitted. Before You my hearing is humbled, and my sight, and my mind, my bones, my nerves and what my feet have mounted upon (for travel).

Muslim 1/534, Abu Dawud, An-Nasa'i and At- Tirmidhi.

سُبْـحانَ ذي الْجَبَـروت، والمَلَـكوت، وَالكِبْـرِياء، وَالْعَظَـمَةِ

Glory is to You, Master of power, of dominion, of majesty and greatness.

Abu Dawud 1/230, An-Nasa'i and Ahmad. Its chain of narration is good (Hasan).