1 John 5:2

1 Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten 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 grievous.

4 For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even 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