John 8:56-58 → Isaiah 41:26

Jesus declares, "Your father Abraham rejoiced that he would see My day. He saw it and was glad," and then, "before Abraham was born, I am!" (John 8:56-58) — a self-identification with the divine "I AM" of Exodus 3:14. Isaiah 41:26 belongs to the courtroom polemic in which the LORD challenges the idols to prove their deity by foreknowledge: "Who has declared this from the beginning, so that we may know... 'He was right'? No one announced it, no one foretold it." In Isaiah, the capacity to declare things "from the beginning" — to stand sovereignly over past and future — is the mark of the true God against the empty idols (cf. Isa 41:4, "I, the LORD, am the first, and I am the last"). When Jesus claims existence before Abraham and uses the absolute "I am," He locates Himself precisely where Isaiah locates Yahweh alone: the One who is from the beginning and over all time. The method is Longitudinal Theme, not Promise-Fulfillment: Isaiah 41:26 is a courtroom challenge, not a promise, and the note is Christological — Jesus appropriates the very self-predications by which Isaiah's God distinguishes Himself from all rivals (so John's "I AM" sayings echo Isaiah's ani hu). The telos is worship: the One Abraham longed to see and rejoiced over is the eternal I AM now present in the flesh, so that to behold Him is to meet the God who alone declares the end from the beginning — and to find Him gladly desirable, as Abraham did.