2- The takbīr for bowing is prescribed, and it is to be pronounced while moving from the standing position into bowing.
3- The tasmiʿ—saying, “Allah hears whoever praises Him”—is for both the imam and the lone worshipper, and it is uttered while rising from bowing.
4- The taḥmid—“Our Lord, to You belongs all praise”—is required of the imam, the follower, and the lone worshipper alike, and it is said once one is fully upright.
5- Tranquillity (ṭumaʾnīnah) is required after straightening up from bowing.
6- A takbīr is said during the descent from standing to prostration.
7- Another takbīr is said while rising from the prostration to the sitting posture between the two prostrations.
8- Everything mentioned above—apart from the opening takbīr—is to be done in every rakʿah.
9- A takbīr is also said when rising from the first tashahhud to the standing position in prayers that contain two tashahhuds.
10- The wording “when” (ḥīn) indicates that the takbīr must coincide exactly with the movement: it should neither precede the transition nor trail behind it. This is the legislated practice. Ibn Daqīq al-ʿĪd said: “Such has been the continuous practice of the people and of the leading jurists in every land.”
11- Nāṣir al-Dīn Ibn al-Munayyir noted that renewing the takbīr in every rakʿah and at every motion is akin to renewing one’s intention.

Benefit:
In some transmissions of the ḥadith the wording is “rabbana laka al-ḥamd” (“Our Lord, to You belongs all praise”), while in others it is “rabbana wa laka al-ḥamd” (“Our Lord—and to You belongs all praise”), with the conjunction wāw explicitly present. The latter version is found in most narrations and is therefore stronger and preferable, for the wāw adds a purposeful nuance.

Hadith Seven
Al-Barāʾ ibn ʿĀzib (may Allah be pleased with him) said: “I kept a close watch on the prayer of Muhammad ﷺ and found that his standing, his bowing, his straightening after bowing, his prostration, his sitting between the two prostrations, his second prostration, and his sitting from the time he gave the salām until he departed were all nearly equal in length.”

In the wording reported by al-Bukhārī: “Except for the standing (recitation) and the sitting, the rest were roughly equal in length.”