1 John 3:23

23Andκαὶthisαὕτηisἐστὶνtheἡcommandmentἐντολὴof Himαὐτοῦ,thatἵναwe should believeπιστεύσωμενin theτῷnameὀνόματιtheτοῦSonυἱοῦof HimαὐτοῦJesusἸησοῦChristΧριστοῦandκαὶwe should loveἀγαπῶμενone anotherἀλλήλους,just asκαθὼςHe gaveἔδωκεν[the] commandmentἐντολὴνto usἡμῖν.

And this is His commandment, that we should believe in the name of His Son, Jesus Christ, and we should love one another, just as He gave the commandment to us.