And We hadn't sent before you any Messenger with revelations except men among the concerned countries; so, didn't you travel through the earth and observe how the consequence of those before them was? And the eternal house of the Hereafter is best for the heedful; then will you not utilize your intelligence?
This verse is a reply to the question of disbelievers that why not an Angel is sent down to them as Messenger as explained in verses 6: 8-9. Verses 16: 43 and 21: 7 say: "And We hadn't sent before you any Messenger with revelations except men, so if you don't know a thing, you have to ask the one who knows Adhikr-the Three-Time-Knowledge". Adhikr is the Knowledge revealed to 313 Messengers from Noah to Muhammad as explained in verse 3: 18.
When all the people of concerned Messenger become wrongdoers and transgressors by hiding and rejecting Adhikr, they are destroyed while Lord saved the Messenger and believers with him as explained in verses 6: 131-133. The believer is commanded to say these wrongdoers: “You travel along with the earth and see how the consequence of Mujirims was” as explained in verse 10: 75. See explanation 6: 32; 9: 67-68 and 10: 101-103.