Leviticus 4 speaks about times when people sin unintentionally, those who break God’s law without knowing it. Even when the sin occurs without forethought, as you come to be aware of the sin, guilt is incurred. Only a sin offering of blood is acceptable for forgiveness of this sin. Then the sacrifice is burned for atonement and the fat is burned for the sacrifice of well-being.
So often we feel that if we didn’t know we are sinning we are not responsible for the sin. God makes it clear that even then, we have sinned and when we become aware of the sin we need ask for forgiveness.
Leviticus 5 speaks of several sins: not coming forward to testify when a public appeal is made; touching unclean things; and uttering a rash oath for a good or a bad purpose. Again a sin offering must be made.
In our society, often we become invisible when the justice system is looking for a witness, in God’s law this is considered a sin. Also, promising to do something rashly, whether for a good or bad purpose is considered a sin. It is important to make a considered promise.
It also speaks of unintentionally committing a trespass or sin in the holy things of the Lord, which seem to be things regarding worship. Not only should a guilt offering be offered in this case but restitution must be made.
Psalm 20 is a song of blessing before a battle. Of note is verse 7 which states that others take pride in their might, their ability, but we take pride in the Lord.
Psalm 21 appears to be a song of thanks as the result of God’s blessings on the battlefield. The king gives God the glory for the victory and continues to put his trust in Him.