Offerings of dedication: Numbers 7
7:1-2 On the day Moses set up the Tabernacle, he anointed it and set it apart as holy. He also anointed and set apart all its furnishings and the altar with its utensils.Then the leaders of Israel—the tribal leaders who had registered the troops—came and brought their offerings.
Each leader of the twelve tribes of Israel brought the same thing to dedicate the tabernacle: silver containers filled with flour and oil, a gold container filled with incense, a young bull, a ram, and a one-year-old male lamb for a burnt offering, a male goat for a sin offering and finally, for a peace offering, two bulls, five rams, five male goats, and five one-year-old male lambs.
It was a highly organised affair, with one offering a day: twelve tribes, twelve days of offerings.
The whole point of this was to help the Israelites remember they were not just any old group, but a people selected by a holy God. He would look after them, and they would dedicate themselves to him.