Matthew Poole and continuators on Genesis 8:20

20. And Noah built an Altar unto the Lord , and took of every clean Beast, and of every clean Fowl, and offered Burnt-offerings on the Altar .

The first Altar we read of, but not the first which was built: For the Sacrifices which were offered before, Gen. 4. 3. 4. presuppose an Altar. Therefore it is no sufficient evidence, that such things were not done, because they are not said to be done in Scripture. Which will be an useful consideration for the understanding of many passages in Scripture hereafter.

The first thing Noah doth, is to pay his debt of Justice and Gratitude to that God which had so miraculously preserved him, and restored him to his antient and proper habitation. God respects to be served in the first place. What Beasts were clean and what unclean, see on chap. 7. 2. Levit. 11. 2. &c.