“There I will meet with the people of Israel, and it shall be sanctified by my glory” (v42). While most ancient religions had symbolic rituals of worship, the One God, the Creator, promised to truly dwell among the Israelites. Humans cannot casually approach His presence, so Aaron and his descendants needed to be “consecrated” (set apart as holy) by sacrifices and burnt offerings (v1). This did not make the priests sinless, but it covered their guilt and allowed them to stand before God.
“I will dwell among the people of Israel and will be their God” (v45). Because He loves us, God does abandon us to the isolation of sin; He makes a way to come and live among us.