Where in the Bible does it talk about promise of a Redeemer?

Where in the Bible does it talk about the first promises of a Redeemer?? I know Genesis 3:15, but are there others? And why did God decide to send a Redeemer??

Messiah: Promises of Christ’s coming

Here are a few:
Gen. 3:15, Gen. 12:3: Gen 18:17-18; Gen. 22:16-18; Gen. 26: 2-4; Gen 28:12-14; Gen 49:10 & 26; Numbers 24:17-24; Deut 18:15; Is 7:14; Is 9,:6-7; Is 11:1-5; Is 59:20; Is 62: 1-4; Jer 33:15-16; Bar 3:36-38; Ezech 24:23; Ezech 34, 29; Dan 9:24-25; Mich 5:2; Zach 3: 8; Zach 9:9; Malachi 3:1-2

You’ll also find a list of Messianic prophecies fulfilled by Jesus at scripturecatholic.com/messianic_prophecies.html

The Messiah of Prophecy

And why did God decide to send a Redeemer??

In brief:

Catechism of the Catholic Church:

622 The redemption won by Christ consists in this, that he came “to give his life as a ransom for many” (Mt 20:28), that is, he “loved [his own] to the end” (Jn 13:1), so that they might be “ransomed from the futile ways inherited from [their] fathers” (I Pt 1:18).

623 By his loving obedience to the Father, “unto death, even death on a cross” (Phil 2:8), Jesus fulfills the atoning mission (cf. Is 53:10) of the suffering Servant, who will “make many righteous; and he shall bear their iniquities” (Is 53:11; cf. Rom 5:19).

Further reading:
*Catechism of the Catholic Church * sections 601-623

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