Then would you possibly leave [out] some of what is revealed to you,1 or is your breast constrained by it because they say, "Why has there not been sent down to him a treasure or come with him an angel?" But you are only a warner. And Allāh is Disposer of all things.
Translation: Saheeh International (English)
1 Knowing of the Prophet's difficulties, Allāh (subḥānahu wa taʿālā) urges him to patience, certain that he would not fail to convey the message in its entirety.
Perhaps you, O Messenger, because of their disbelief, stubbornness and demand for signs, will leave out conveying some of what Allah has instructed you to convey because they will find it difficult to practise; and perhaps your heart will be reluctant to convey it, so that they do not say, ‘Why has no rich treasure been sent down to him or why has no angel come with him to confirm his truthfulness?’ Do not leave some of what is revealed to you because of that. You are only a warner who conveys what Allah has instructed you to convey. You do not have to bring the signs they request for. Allah takes care of everything.