1st John 3:10-15

The Imperative of Love

(Matt. 22:39 )

10 In this the children of God and the children of the devil are manifest: Whoever does not practice righteousness is not of God, nor is he who does not love his brother. 11 For this is the message that you heard from the beginning, that we should love one another, 12 not as Cain who was of the wicked one and murdered his brother. And why did he murder him? Because his works were evil and his brother’s righteous.

13 Do not marvel, my brethren, if the world hates you. 14 We know that we have passed from death to life, because we love the brethren. He who does not love his brother[fn] abides in death. 15 Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him.

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For deeper study: David Guzik Commentary