Friend is a person whom one knows and with whom one has a bond of mutual affection.
Commitment is the word that unlocks the real meaning of friendship.
That being said, James 2:23 says, And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God.
1st John 3:1 Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not.
Matthew 11:28 Come unto me, all ye that labour and are heavy laden, and I will give you rest.
Revelation 3:20 Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.
And my favorite is John 15:13-15:
It is so encouraging to know that the Lord is our friend, he says we are no longer servants but friends. He calls me friend!