“Then Ruku‘ is also respect, which is greater than the standing posture.” (Malfuzat (10 vol. edition), vol. 9, pp. 110)
“The bowing down of the spirit before God means that, by renouncing all other love and relationships, it has turned to God and belongs to Him alone.” (Lecture Sialkot, pp. 33)
“It is a matter of principle that when someone accepts the greatness of another, they bow in their presence. A person must bow in the face of greatness. Hence, with the tongue a person states: “Holy is my Lord the most Great” and through their outwardly state, they demonstrate this by bowing. This statement is expressed visually through the bowing position.” (Malfuzat (English), vol. 2, pp. 148)
“The bowing position, which is the second posture in Prayer, demonstrates that one submits themselves by lowering their head in preparation to fulfil any command that may be given to them, as it were.” (Malfuzat (English), vol. 1, pp. 161)
“At the end of the recitation, the Imam goes from the Standing position to the Bowing position, Ruku‘, by calling out Allahu Akbar … In this posture, the right hand of the worshipper should press the right knee and the left hand the left knee, and the upper half of the body from the waist to the head is kept level and horizontal to the ground. In the Bowing posture the following Tasbih is recited silently three times or more in odd numbers:” (Salat-The Muslim Prayer Book, pp. 41)
Holy is my Lord, the Most Great