The covenant between God and His people in the text was a promise from Israelites to take the responsibility of the support of the temple ...upon themselves. They turned their offerings of corn, wine, oil and all of their other things they brought as a tithe to the temple. The temple treasury would be in the sanctuary. All of those called to the service of the LORD, whether they be priests, porters, singers or other workers would live of the offerings.
There is a lesson in this for the Christian. When we become Christians, we go into covenant relationship with God. We must take responsibility for our portion of the care and upkeep of our church. We must not shirk our duty of giving our portion of money to the church we attend.