28:1, 2 Offerings had to be brought regularly and presented according to prescribed rituals under the priests’ supervision. Following these rituals took time, and this gave the people the opportunity to prepare their hearts for worship. Unless our hearts are ready, worship is meaningless. By contrast, God is delighted, and we get more from it, when our hearts are prepared to come before him in a spirit of thankfulness.
28:9, 10 Why were extra offerings made on the Sabbath day? The Sabbath was a special day of rest and worship commemorating both creation (Exodus 20:8-11) and the deliverance from Egypt (Deuteronomy 5:12-15). Because of the significance of this special day, it was only natural to offer extra sacrifices on it.