Genesis 8:20 - Coke's Commentary on the Holy Bible

Noah builded an altar, &c.— Offerings and sacrifices necessarily imply the whole apparatus required; Cain and Abel could not have sacrificed without an altar. But that original one being destroyed, Noah erected a new one, on which to offer his sacrifice of clean beasts and clean birds. This seems to prove, as plainly as possible, the use of sacrifice before the deluge; as we read of no new revelation respecting that matter to Noah, and as it is plain his offerings were acceptable to God from the following verse.