a. an act of giving up something valued for the sake of something else regarded as more important or worthy.
b. the surrender or destruction of something prized or desirable for the sake of something considered as having a higher or more pressing claim.
"Greater love has not one than this, that he lay down his life for his friends." - Jesus (John 15:13)
"I have come that they may have life, and have it to the full. I am the good shepherd. The good shepherd lays down his life for the sheep." - Jesus (John 10:10b-11)
"Praise be to the God and Father of our Lord Jesus Christ! In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead, and into an inheritance that can never perish, spoil or fade - kept in heaven for you..." - 1 Peter 1:3,4