16 This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers and sisters.

Read 1 John 3:16 Using Other Translations

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.
By this we know love, that he laid down his life for us, and we ought to lay down our lives for the brothers.
We know what real love is because Jesus gave up his life for us. So we also ought to give up our lives for our brothers and sisters.