سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
I.e., a spiritual kingdom, which could not be inherited by anyone and, hence, would not be exposed to envy or worldly intrigue.
The seeking of worldly Power, even if intended to be used for Allah's service, has a little of Self in it. It may be quite legitimate and even meritorious in ordinary men, but even the thought of it in a Prophet is to be apologised for. See a similar idea in the case of David explained in n. 4176 to xxxviii. 24 above.
He asked for a Power that he would not misuse, though others might not be able to refrain from misusing it,-such as power over forces of nature or forces of violence (see the next three verses).
Cf. xxxviii. 9 above.