that is ḥasan (sound).

[Explanation]
The Prophet’s ﷺ words, “By Him in whose hand my soul rests,” are an oath. In it he swears by Allah, for He alone holds the souls of His servants in His hand: He guides whom He wills, lets stray whom He wills, gives life to whom He wills, and causes death to whom He wills. Thus the souls are in Allah’s hand with respect to guidance and misguidance, life and death, as Allah the Exalted says: “and by the soul and the One who fashioned it, then inspired it with its depravity and its God-consciousness” (al-Shams 91:7-8). Because the souls are under Allah’s exclusive control, the Prophet ﷺ would often swear using this formula, “By Him in whose hand my soul rests,” and at times he would say, “By Him in whose hand Muhammad’s soul rests,” for the soul of Muhammad ﷺ is the noblest of souls, and he mentioned it for that reason.

He then clarified the subject of the oath: that we must enjoin what is right and forbid what is wrong, otherwise Allah will encompass us with a punishment from Himself so that we will call upon Him and He will not answer us. We ask Allah for safety and well-being.

We have already encountered several hadiths demonstrating the obligation of enjoining right and forbidding wrong, and warning against neglecting it. Accordingly, it is incumbent upon all of us to command what is right: if we see a brother who has fallen short in fulfilling a duty, we advise him to observe it and caution him against disobeying; and if we see a brother committing something forbidden, we forbid him from it and warn him against it—so that we may remain one united community. For if we scatter and each of us follows his own inclination