Upset over Disbelief

If their rejection weighs heavily on you, then if you can find a tunnel into the earth or a ladder to the sky to bring them a sign, do so! But if Allah had willed, He could have guided them all. So do not be among the ignorant.

6:35And if their aversion is grievous unto thee, then, if thou canst, seek a way down into the earth or a ladder unto the sky that thou mayst bring unto them a portent (to convince them all)! - If Allah willed, He could have brought them all together to the guidance - So be not thou among the foolish ones.

Perhaps you will exhaust yourself with grief over them if they do not believe in this message.

18:6Yet it may be, if they believe not in this statement, that thou (Muhammad) wilt torment thy soul with grief over their footsteps.

26:3It may be that thou tormentest thyself (O Muhammad) because they believe not.

If they reject you, messengers before you were also rejected. To Allah, all matters return.

35:4And if they deny thee, (O Muhammad), messengers (of Allah) were denied before thee. Unto Allah all things are brought back.

But if they disobey you, say, “I am free of what you do.”

26:216And if they (thy kinsfolk) disobey thee, say: Lo! I am innocent of what they do.

Thus, We have made enemies for every prophet among the wicked

25:31Even so have We appointed unto every prophet an opponent from among the guilty; but Allah sufficeth for a Guide and Helper.

Whenever they bring an argument, We bring the truth and the best explanation.

25:33And they bring thee no similitude but We bring thee the Truth (as against it), and better (than their similitude) as argument.