He saw it — By faith in types, figures, and promises; as particularly in Melchisedec; in the appearance of Jehovah to him in the plains of Mamre, Genesis 18:1; and in the promise that in his seed all the nations of the earth shall be blessed. Possibly he had likewise a peculiar revelation either of Christ's first or second coming.
Related Commentaries of John 8:56
John 8:56
56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.