1 John 5:2

1 Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the Father also loves those born of Him.

By this we know that we love the children of God: when we love God and keep His commandments.

3 For this is the love of God, that we keep His commandments. And His commandments are not burdensome,

4 because everyone born of God overcomes the world. And this is the victory that has overcome the world: our faith.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
By this we know that we love the children of God: when we love God and keep His commandments.
KJV
By this we know that we love the children of God, when we love God, and keep his commandments.
WEB
By this we know that we love the children of God, when we love God and keep his commandments.
ASV
Hereby we know that we love the children of God, when we love God and do his commandments.
DARBY
Hereby know we that we love the children of God, when we love God and keep his commandments.
BLB
In this we know that we love the children of God, when we love God and keep His commandments.
ÅB
På dette kjenner vi at vi elsker Guds barn, når vi elsker Gud og holder hans bud.
OTB
Dette er hvordan vi vet at vi elsker Guds barn: når vi elsker Gud og holder Hans bud.
B1930
På dette kjenner vi at vi elsker Guds barn, når vi elsker Gud og holder hans bud.

Study notes (Tyndale)

Original text and word study

Cross references