1 John 2:3-8 New King James Version (NKJV)

The Test of Knowing Him

³ Now by this we know that we know Him, if we keep His commandments. ⁴ He who says, “I know Him,” and does not keep His commandments, is a liar, and the truth is not in him. ⁵ But whoever keeps His word, truly the love of God ^[a]is perfected in him. By this we know that we are in Him. ⁶ He who says he abides in Him ought himself also to walk just as He walked.

^7 [b]Brethren, I write no new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the word which you heard ^[c]from the beginning. ⁸ Again, a new commandment I write to you, which thing is true in Him and in you, because the darkness is passing away, and the true light is already shining.