Is the act of rising from prostration, sitting upright, and pausing obligatory (Wajib)?

Primary text

Rising from prostration, sitting upright, and pausing between the two prostrations is obligatory. This view is held by Al-Shafi'i. This is evidenced by the Prophet's command to the one who prayed poorly: 'Then sit until you are settled in your sitting.' The Prophet, peace be upon him, also habitually performed this action, and it is narrated that he never omitted it. Aisha reported that when he raised from prostration, he would not prostrate again until he was sitting upright. Since raising from the second prostration is obligatory, the resulting upright sitting must also be obligatory, similar to rising from the final prostration.