The word(s) "trustee" appears 8 time(s) in 8 verse(s) in Quran in Mohsin Khan translation.

(1) Such is Allah, your Lord! La ilaha illa Huwa (none has the right to be worshipped but He), the Creator of all things. So worship Him (Alone), and He is the Wakil (trustee, Disposer of affairs, Guardian) over all things.

(2) Had Allah willed, they would not have taken others besides Him in worship. And We have not made you a watcher over them nor are you a Wakil (disposer of affairs, guardian, trustee) over them.

(3) So perchance you (Muhammad صلى الله عليه و سلم) may give up a part of what is revealed unto you, and that your breast feels straitened for it because they say, "Why has not a treasure been sent down unto him, or an angel has come with him?" But you are only a warner. And Allah is a Wakil (Disposer of affairs, trustee, Guardian) over all things.

(4) And put your trust in Allah, and Sufficient is Allah as a Wakil (trustee, or Disposer of affairs).

(5) And obey not the disbelievers and the hypocrites, and harm them not (in revenge for their harming you till you are ordered). And put your trust in Allah, and Sufficient is Allah as a Wakil (trustee, or Disposer of affairs). [Tafsir Al-Qurtubi]

(6) Verily, We have sent down to you (O Muhammad صلى الله عليه وسلم) the Book (this Qur'an) for mankind in truth. So whosoever accepts the guidance, it is only for his ownself, and whosoever goes astray, he goes astray only for his (own) loss. And you (O Muhammad صلى الله عليه وسلم) are not a Wakil (trustee or disposer of affairs, or guardian) over them.

(7) Allah is the Creator of all things, and He is the Wakil (trustee, Disposer of affairs, Guardian) over all things.

(8) Believe in Allah and His Messenger (Muhammad صلى الله عليه وسلم), and spend of that whereof He has made you trustees. And such of you as believe and spend (in Allah's Way), theirs will be a great reward.