Genesis 8:20

20Then Noah built an altar to the Lord. He took some of every kind of
clean: When something is clean, it is holy or acceptable to God. When it is unclean, it is unholy (such as an unclean spirit). The term can be used in a ritual sense to apply to moral standards for living.
clean animal and every kind of clean bird and offered
burnt offering(s): Or holocaust, an offering completely burned to ashes; it was used in connection with worship, seeking God's favor, expiating sin, or averting judgment.
burnt offerings on the altar.
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