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Why did Christ came into this world?

Matt 1:21

21 And she shall bring forth a son, and thou shalt call his name Jesus: for he shall save his people from their sins.

It was for a Salvaic or Redemptive purpose established before the world began via the Everlasting Covenent or the Eternal Purpose in Christ Eph 3:11

11 According to the eternal purpose which he purposed in Christ Jesus our Lord: