Exodus 13:13

The ass is here mentioned as a representative of 'unclean' domestic animals (see Leviticus 11:2.) which could not be offered in sacrifice. For such, a lamb was to be substituted; if not, its neck must be broken. This would ensure its redemption, as every one would prefer parting with a lamb to losing an ass. Human sacrifices are strictly forbidden, hence firstborn males must be redeemed. The tribe of Levi was substituted for them, and in addition the sum of five shekels was paid as the redemption price of each firstborn male: see Numbers 8:6; Numbers 18:15; Numbers 18:16. To this day the Jews solemnise the 'redemption of the firstborn' on the thirtieth day after birth. This was the rite performed by Joseph and Mary on behalf of the child Jesus as recorded in Luke 22:2; Luke 22:23.

17-22. The March to Etham.