The Prophet Ezekiel.
Jesus told a story of a man who went to hell, and begged Abraham in
heaven to warn his brothers. But Abraham said they already had the
testimony of the prophets so if that wasn't good enough for
them, then nothing else would make a difference either.
In other words... the proof that God offers to unbelievers is the
testimony of those who know their God personally. God puts that
much value on, and confidence in, the faith of those who trust
Him!
The Word of the Old Testament Prophets came true, just as
predicted, and against all odds. Jesus was born in a lowly place,
lived a miraculous life, died a horrible death, and defied the
grave by rising from the dead. There is no other gospel like that
of the Lord Jesus Christ.
Artist is Gustave Dore 1832-1883, France