Parallel
1 John 3:11
Patriarchal Greek New Testament (1904) · Berean Standard Bible
ὅτι αὕτη ἐστὶν ἡ ἀγγελία ἣν ἠκούσατε ἀπ᾽ ἀρχῆς, ἵνα ἀγαπῶμεν ἀλλήλους,
This is the message you have heard from the beginning: We should love one another.