What the Bible says about Sacrificial Lamb

Exodus 13:11-13

The word redeem means "buy back." If a family's firstborn donkey was critical to their livelihood, they could buy it back from God by offering a lamb in its place. Of course, God did not demand that His people offer their firstborn children as literal human sacrifices. They, too, were to be bought back by means of a lamb sacrifice.

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The Law of the Firstborn