Exodus 25:2

25:2 “Tell the Israelites to take an offering for me; from every person motivated by a willing heart you are to receive my offering.

Exodus 29:24

29:24 You are to put all these in Aaron’s hands and in his sons’ hands, and you are to wave them as a wave offering before the Lord.

Exodus 35:22

35:22 They came, men and women alike, all who had willing hearts. They brought brooches, earrings, rings and ornaments, all kinds of gold jewelry, and everyone came who waved a wave offering of gold to the Lord.