1 John 4:9-10
4:9 By this the love of God is revealed in us: that God has sent his one and only Son into the world so that we may live through him.
4:10 In this is love: not that we have loved God, but that he loved us and sent his Son to be the atoning sacrifice for our sins.
1 John 4:13
4:13 By this we know that we reside in God and he in us: in that he has given us of his Spirit.
1 John 4:17
4:17 By this love is perfected with us, so that we may have confidence in the day of judgment, because just as Jesus is, so also are we in this world.
1 John 5:2
5:2 By this we know that we love the children of God: whenever we love God and obey his commandments.