Genesis 8:20

The first thing which Noah did, was to build an altar for burnt sacrifice, to thank the Lord for gracious protection, and pray for His mercy in time to come. This altar - מזבּח, lit., a place for the offering of slain animals, from זבח, like θυσιαστήριον from θύειν - is the first altar mentioned in history. The sons of Adam had built no altar for their offerings, because God was still present on the earth in paradise, so that they could turn their offerings and hearts towards that abode. But with the flood God had swept paradise away, withdrawn the place of His presence, and set up His throne in heaven, from which He would henceforth reveal Himself to man (cf. Gen 9:5, Gen 9:7). In future, therefore, the hearts of the pious had to be turned towards heaven, and their offerings and prayers needed to ascend on high if they were to reach the throne of God. To give this direction to their offerings, heights or elevated places were erected, from which they ascended towards heaven in fire. From this the offerings received the name of עלת from עולה, the ascending, not so much because the sacrificial animals ascended or were raised upon the altar, as because they rose from the altar to haven (cf. Jdg 20:40; Jer 48:15; Amo 4:10). Noah took his offerings from every clean beast and every clean fowl - from those animals, therefore, which were destined for man's food; probably the seventh of every kind, which he had taken into the ark. "And Jehovah smelled the smell of satisfaction," i.e., He graciously accepted the feelings of the offerer which rose to Him in the odour of the sacrificial flame. In the sacrificial flame the essence of the animal was resolved into vapour; so that when man presented a sacrifice in his own stead, his inmost being, his spirit, and his heart ascended to…

Here is, I. Noah's thankful acknowledgment of God's favour to him, in completing the mercy of his deliverance, Gen 8:20. 1. He built an altar. Hitherto he had done nothing without particular instructions and commands from God. He had a particular call into the ark, and another out of it; but, altars and sacrifices being already of divine institution for religious worship, he did not stay for a particular command thus to express his thankfulness. Those that have received mercy from God should be forward in returning thanks, and do it not of constraint, but willingly. God is pleased with free-will offerings, and praises that wait for him. Noah was now turned out into a cold and desolate world, where, one would have thought, his first care would have been to build a house for himself; but, behold, he begins with an altar for God: God, that is the first, must be first served; and he begins well that begins with God. 2. He offered a sacrifice upon his altar, of every clean beast, and of every clean fowl - one, the odd seventh that we read of, Gen 7:2, Gen 7:3. Here observe, (1.) He offered only those that were clean; for it is not enough that we sacrifice, but we must sacrifice that which God appoints, according to the law of sacrifice, and not a corrupt thing. (2.) Though his stock of cattle was so small, and that rescued from ruin at so great an expense of care and pains, yet he did not grudge to give God his dues out of it. He might have said, "Have I but seven sheep to begin the world with, and must one of these seven be killed and burnt for sacrifice? Were it not better to defer it till we have greater plenty?" No, to prove the sincerity of his love and gratitude, he cheerfully gives the seventh to his God, as an acknowledgment that all was his, and owing to him. Servin…

8:20 This first mention of an altar in the Bible shows Noah’s gratitude for having passed through the judgment. • sacrificed as burnt offerings: The same wording is used of the whole burnt offering in Leviticus (Lev 1:3-9); however, it can refer to any offering that is burned. Noah gave this offering to thank and worship God, who had delivered him and his family from the flood.