A covenant is a solemn agreement. The most important covenants in the Bible are those in which God makes a covenant with man: the Abrahamic Covenant, the Davidic Covenant, etc. Here is a covenant which man makes with God. The Israelites recognize the importance of God and covenant together to wholly follow Him.
The Levitical sacrificial system had five separate and distinct offerings that could be made to the Lord.
It is not enough that the offering is brought; it must be acceptable to God. God must receive it.
Fear is the negative emotion of dread toward anticipated future evil.
A need broke the heart of Nehemiah. Others saw the problem, but he sought a solution from God with all his heart. Because of his broken heart and because of his willingness to be a part of the solution, the Lord sent him to bring about the solution. We have much to learn from this lesson.