The Blood, the Covering, THE BLOOD.

The covenant love of God required that innocent animals be sacrificed to provide garments of skin as a covering for Adam and Eve. This early foreshadowing of substitutionary atonement points toward the necessity of judgment upon the innocent to provide a covering for the guilty. Adam and Eve made a vain attempt to cover themselves with their own efforts by sewing together fig leaves. However, God’s order provided covering by means of a sacrifice. Under the New Covenant, we are required to be clothed with Christ rather than with our good works (Gal. 3:27).

Taken from New Spirit-Filled Life Bible