Yochanan I 4:21

21 And this mitzvah we have from Him that the one having ahavah for Hashem should have ahavah also for the Ach b’Moshiach of him.

Yochanan I 4:21 Meaning and Commentary

1 John 4:21

And this commandment have we from him
Either "from God", as the Alexandrian copy and the Vulgate Latin version read; and that to love the brethren is a commandment of God, is clear from ( 1 John 3:23 ) ; or from Christ, for it is also a command of his, even his new commandment, which he has given, and his people have received from him:

that he who loveth God, love his brother also;
see ( John 13:34 ) ( John 15:12 John 15:17 ) ; which is an argument persuading to attend to the one as well as to the other; for the same command that requires the one, requires the other: and he that transgresses it in one case, is a transgressor of it, as well as in the other.

Yochanan I 4:21 In-Context

19 We have ahavah because rishonah He had ahavah for us.

20 If anyone says I have ahavah for Hashem and the Ach b’Moshiach he hates, he is a shakran (liar). For the one not having ahavah for the Ach b’Moshiach of him whom he has seen, how can he have ahavah for the Elohim whom he has not seen?

21 And this mitzvah we have from Him that the one having ahavah for Hashem should have ahavah also for the Ach b’Moshiach of him.