Parallel
1 John 4:21
Patriarchal Greek New Testament (1904) · Berean Standard Bible
καὶ ταύτην τὴν ἐντολὴν ἔχομεν ἀπ᾽ αὐτοῦ, ἵνα ὁ ἀγαπῶν τὸν Θεὸν ἀγαπᾷ καὶ τὸν ἀδελφὸν αὐτοῦ.
And we have this commandment from Him: Whoever loves God must love his brother as well.