Acts 15:15-18 to Isaiah 45:21

OT Source(s):

Isaiah 45:21 ("Was it not I, the LORD? And there is no other God besides Me... known from of old")

Source: Beale & Carson (eds.), Commentary on the New Testament Use of the Old Testament (2007); Theoretical

Reference Type: Allusion

Connection Method(s): Redemptive-Historical Progression + Longitudinal Theme

Significance: James' closing statement in Acts 15:18 — "known from of old" (gnōsta ap' aiōnos) — echoes the divine declaration in Isa 45:21: "Who told this long ago? Who declared it of old? Was it not I, the LORD?" (mi higgid mizze'az?). In Isa 45, the context is Yahweh's proof of his uniqueness: he alone declared the future "from ancient times" (me'az), and his announcement of Cyrus as deliverer proves this. The Acts 15:18 echo draws this logic into the Jerusalem council's deliberation: the inclusion of Gentiles is not a surprise development but was "known from of old" in God's plan — the same argument Isa 45:21 makes about salvation coming to "all the ends of the earth" (Isa 45:22). The gnōsta language positions James as applying Isaiah's "declaration from of old" epistemology to the present Gentile mission.