Exodus 35:29

35:29 The Israelites brought a freewill offering to the Lord, every man and woman whose heart was willing to bring materials for all the work that the Lord through Moses had commanded them to do.

Exodus 36:3

36:3 and they received from Moses all the offerings the Israelites had brought to do the work for the service of the sanctuary, and they still continued to bring him a freewill offering each morning.