Exodus 35-37

In the wilderness of Sinai the freed slaves where asked to consider giving an offering for the work of the LORD. In these gifts God was looking for two characteristics.  He was depending on the people to give in order to construct the tabernacle. The offering requested was not a sacrifice for sin that would be consumed in the fire. It was a practical gift that would be remade into an instrument of worship.   God was also looking for willing hearts among his people. Exodus 35:29 indicates that the people gave both.
Stuart