Pay careful attention so that you do not refuse [to hear] God when He speaks to you. [See verse 9]. For if those people [i.e., the Israelites] did not escape [judgment] when they refused [to hear] Him who warned them on earth [i.e., God speaking through Moses at Mount Sinai], how much less [likely] will we escape [judgment] if we reject Him who warns from heaven [i.e., Christ]?

These priests serve [in a sanctuary] that is [only] a copy and a foreshadow of the heavenly one. Now Moses was warned [by God] when he was about to build the Tabernacle, for God said [Ex. 25:40], "See that you make everything according to the pattern that was shown to you on the mountain [i.e., Mount Sinai]."

By [having] faith, when Noah was warned [by God] about conditions that had not yet been seen [i.e., regarding events of the coming Flood], he acted out of reverent concern [for God] by constructing a ship to save [i.e., rescue] his household [from the Flood waters]. By this [i.e., his faith which led to action], Noah condemned the world and inherited righteousness because of his faith.

Look carefully [at how you are living] so that no one falls away from God's unearned favor, and that no "poisonous plant sprouts up" to cause trouble and corrupt many people [Note: This is an analogy from Deut. 29:16-18 being used as a warning against the evil influence of wicked people],