What does the one praying say in his bowing and in the sitting if he prolongs them?

Question:
He says: If the one praying prolongs his prayer, and reads long surahs in his standing, and strives in supplication in his prostration, what does he say in his bowing if he prolongs it, and in the sitting, other than the narrated remembrances?

Answer:
He recites the tasbih, the tasbih of bowing and prostration: "Subhan Rabbi al-Azim" (Glory be to my Lord, the Exalted) in bowing, and "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High) in prostration. It is obligatory to say it once, and if he increases to three, to seven, to ten, that is better. Everything he adds to the tasbih of bowing and prostration is better. He supplicates with whatever is easy for him; he supplicates with whatever is easy for him and whatever supplications come to his mind, especially in prostration. He strives in supplication in prostration because it is a place where supplication is answered, as the Messenger (peace and blessings be upon him) said. So he supplicates with whatever supplications come to his mind, whether they are from the Qur'an, from the Sunnah, or from supplications that do not contradict the Book and the Sunnah. Yes.