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Intercessory Prayer:

Christ’s prayer to His Father as recorded in John 17.

Intertestamental Period:

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The period between the Old Testament and the New Testament.

Irenaeus:

(ca. AD 130–200) An early Christian theologian and the author of Against Heresies, a polemic against many variations of Christian doctrine.

Isaiah:

A late eighth-century BC prophet in the Old Testament who prophesied about the Messiah (Christ) as the Redeemer.