He عليه السلام, peace be upon him, only said ‘Do not look at what I do’ so that it would not be assumed that it is obligatory upon them in the manner of an obligation, and not because He عليه السلام forbade following his action in pursuit of virtue and the seeking of perfection. And sitting between the two prostrations and between the prostration and the standing is among the etiquettes (adab) of prayer, not among its obligations (fara’id). What clarifies what we have mentioned is what was narrated:
Commentary #16