Of Course, John 3:16 and all time favorite of many.
John 3:16
King James Version (KJV)
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.
Another favorite of mine:
Revelation 3:20
King James Version (KJV)
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.