The same applies to the burnt offerings which were offered by our fathers Noah, Abraham, Isaac and Jacob. They knew about the idea of sacrifices through Tradition entrusted to them. The same is said about the idea of building altars. After the Flood, our Father Noah "built an altar to the Lord" (Gen.8:20), and our Father Abraham built an altar at the great tree of Moreh (Gen.12: 7). The idea of building altars continued thereafter although there was no Holy Bible at the time to command them to do so.