God is to be approached only in the ways he lays down

Exodus 29:1-34
A bull for sin offering, a ram for burnt offering to the Lord, another ram for ordination.
Consecrate those parts of  the ordination ram that belong to Aaron and his sons. This is always to be the regulation from the Israelites fro Aaron and his sons. It is the contribution the Israelites are to make to the Lord from their fellowship offerings.
Everything about this elaborate ceremonial points to the 'otherness' of God. He will be with his people, but there can be no familiarity. God is to be approached only in the ways he lays down. Sin disqualifies everyone from entering God's presence. The priests and every item of equipment must be specially set apart for God's service. So Aaron and his sons must be cleansed, robed and their sins expiated by sacrifice before they may take office. The living God is no impotent image to be worshiped as human beings think fit. God lays down the only terms on which it is possible for him to take up residence with his people
Why?
The ear for hearing and obeying God; the hand and foot to work for him.
How?
Worship the Lord his way he lays down, but not our imagination.