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Then, the worshipper bows in "Ruku" raising his hands up to the level of his shoulders or ears while saying " Allahu Akbar" " Allah is Great" then bends down, making his head and back on one level and putting his hands with the fingers spread on his knees. The worshipper should feel serenity and tranquility while bowing, he should say thrice at least: (( سبحان ربي العظيم )) ""Subhana Rabbiayl A'zim"
which means: "Glory be to my Lord, the Almighty."
It is advisable to say while bowing in addition to that:
(( سبحانك اللهم ربنا و بحمدك ربنا اغفر لي ))
"Subhanak-Allahumma Rabbana wa bihamdika, Allahumma Ighfir liy"
Which means: "Glory be to Thee , O Allah, and I praise Thee, forgive me my sins."