The Leaders Give An Offering - Numbers 7...

Now it came to pass, when Moses had finished setting up the tabernacle, that he anointed it and consecrated it and all its furnishings, and the altar and all its utensils; so he anointed them and consecrated them. Then the leaders of Israel, the heads of their fathers’ houses, who were the leaders of the tribes and over those who were numbered, made an offering. And they brought their offering before the Lord, six covered carts and twelve oxen, a cart for every two of the leaders, and for each one an ox; and they presented them before the tabernacle. Then the Lord spoke to Moses, saying, “Accept these from them, that they may be used in doing the work of the tabernacle of meeting; and you shall give them to the Levites, to every man according to his service.” Now the leaders offered the dedication offering for the altar when it was anointed; so the leaders offered their offering before the altar. For the Lord said to Moses, “They shall offer their offering, one leader each day, for the dedication of the altar.” Now when Moses went into the tabernacle of meeting to speak with Him, he heard the voice of One speaking to him from above the mercy seat that was on the ark of the Testimony, from between the two cherubim; thus He spoke to him.
Numbers 7:1-5,10-11,89 - hNKJV