God is Love.

Love is concern for another's welfare.  The greatest expression of God's love was in the cross of Jesus Christ.

Isaiah 43:4

Since thou wast precious in my sight, thou hast been honourable, and I have loved thee: therefore will I give men for thee, and people for thy life.

Jeremiah 31:3

The LORD hath appeared of old unto me, saying, Yea, I have loved thee with an everlasting love: therefore with lovingkindness have I drawn thee.

John 3:16

For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

John 15:9-13

[9] As the Father hath loved me, so have I loved you: continue ye in my love.
[10] If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love.
[11] These things have I spoken unto you, that my joy might remain in you, and that your joy might be full.
[12] This is my commandment, That ye love one another, as I have loved you.
[13] Greater love hath no man than this, that a man lay down his life for his friends.

Romans 5:8

But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.

1 John 4:7-11

[7] Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.
[8] He that loveth not knoweth not God; for God is love.
[9] In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him.
[10] Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins.
[11] Beloved, if God so loved us, we ought also to love one another.