The Believers - 23:115 "Do you think that We created you for nothing and that you will not return to Us"?"
Allah created mankind in this world to test them:
The Cow/2:155 We will test you with fear, hunger, loss of money, lives, and crops. Give good news to those who are patient.

The Family Of Imran/3:186 You will be tested with your money and your lives. You will hear many insults from those who were given the Book before you and from those who associate partners. If you persevere and lead a virtuous life, you will have done a great deed.

Prophet Jonah/10:14 Then We made you inheritors of the earth in their place, to see what you would do.

The Cave/18:7 We have adorned the earth with its materials to test who will be righteous.

The Prophets/21:35 Every soul will taste death. We test you with good and evil events as a test, and to Us is your return.

The Believers/23:115 "Do you think that We created you for nothing and that you will not return to Us"?"

The Spider/29:2 "Do people think that they will be left untested just by saying, "We believe"?"
The Spider/29:2 "Do people think that they will be left untested just by saying, "We believe"?"

The Family Of Imran/3:142 Do you think that you will enter Paradise until Allah reveals the workers among you and separates those who are patient?

Muhammad/47:31 We will test you and try your qualities until We bring out from among you those who strive and those who persevere against hardship.

The Cow/2:214 "Or do you think that you will enter Paradise until the like of what happened to those before you befalls you? They suffered hardship and distress and were so shaken that the apostle and those who believed with him said, "When is the help of Allah?"Know well that Allah´s help is near."