1 John 2:6

This is how we know that we know him: if we keep his commandments.

One who says, “I know him,” and doesn’t keep his commandments, is a liar, and the truth isn’t in him.

But God’s love has most certainly been perfected in whoever keeps his word. This is how we know that we are in him:

Brothers, I write no new commandment to you, but an old commandment which you had from the beginning. The old commandment is the word which you heard from the beginning.

Again, I write a new commandment to you, which is true in him and in you, because the darkness is passing away and the true light already shines.

He who says he is in the light and hates his brother is in the darkness even until now.