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Where does the Bible say God is love?

It is in 1 John 4:8 · King James Version

«He that loveth not knoweth not God; for God is love.»
Read the chapter 1 John 4 →

See also

1 John 4:16

And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him.

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.