1 John 3:14

Then Cain spoke to Abel his brother; and it happened when they were in the field, that Cain rose up against Abel his brother and killed him.

“Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life.

“By this all will know that you are My disciples, if you have love for one another.”

By this we know that we love the children of God, when we love God and do His commandments.