Adam Clarke on Exodus 29:23

And one loaf of bread - The bread of different kinds, (see Clarke on Exo 29:2 (note)), in this offering, seems to have been intended as a minchah, or offering of grateful acknowledgment for providential blessings. The essence of worship consisted in acknowledging God,

1. As the Creator, Governor, and Preserver of all things, and the Dispenser of every good and perfect gift.

2. As the Judge of men, the Punisher of sin, and he who alone could pardon it.

The minchahs, heave-offerings, wave-offerings, and thank-offerings, referred to the first point. The burnt-offerings, sin-offerings, and sacrifices in general, referred to the second.