Indeed, We have sent the Book down to you with the Truth for you to judge among mankind as Lord Allah is showing to you, and you shouldn’t be an arbiter for the frauds.
This verse teaches that the Lord’s Book Adhikr is revealed upon Messenger Muhammad to judge among mankind according to the intention of the Lord. Whoever doesn’t judge in his individual, family, and social life with the Adhikr, is a disbeliever, wrongdoer, and transgressor as told in verses 5: 44, 45, and 47 respectively. But Fujjar have made their food 'rejecting Adhikr' as told in verse 56: 82. By earning petty price for Lord's Book, they are filling Fire in their bellies, so that Lord will not purify them, talk to them, and look at them as explained in verses 2: 174-176. The believer who testifies Adhikr is commanded to say to these Fujjar: “You enjoy here a little; indeed your returning is into Fire” as explained in verses 14: 28-30. See explanation 2: 147-148; 3: 196-197 and 8: 27-28.