Hereby perceive we the love of God, because he laid down his life for us: and we ought to lay down our lives for the brethren.
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1 John 3:14-18
Tyndale Open Study Notes (CC BY-SA 4.0).
3:16-18 Christ’s example shows that real love involves self-sacrifice. We do this by becoming truly concerned about the needs of others and by unselfishly giving time, effort, prayer, possessions, and even our lives to supply those needs.
Other Bible passages linked to this one, most cited first.
In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him. Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins. Beloved, if God so loved us, we ought also to love one another.
And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.
A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another.
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
This is my commandment, That ye love one another, as I have loved you. Greater love hath no man than this, that a man lay down his life for his friends.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.