Shewbread is literally “bread of the Presence.”
Twelve loaves were placed upon the table before the Lord each Sabbath.
The bread indicated, first of all, Christ, who is the Presence of God, and second, all the people who by partaking of Him, become “one bread;” for the twelve tribes were represented in the twelve loaves.
It was before the Lord continually, for new bread was placed upon the table when the old was eaten; so we, when we present our bodies “a living sacrifice,” are continually renewed.
---The bread of the Presence repeats the mystery of the burning bush; though eaten, it is not consumed, because God’s presence it in it.
The bread was renewed on the Sabbath day, showing that the Sabbath is to give us fresh life for service."
E.J. Waggoner