Exodus 28:5

And they shall take
The Targum of Jonathan adds, out of their substance; that is, those that were wise hearted, and had knowledge and skill in making such garments; these were to take, not out of their own personal substance, but they were to take or receive from Moses what the people freely offered for such service, ( Exodus 36:3 ) ,

gold, and blue, and purple, and scarlet, and fine linen;
pieces of gold, which they beat into thin plates, and drew into wires, and which they worked into stuffs, woollen or linen, or both, of the colours here mentioned; all which were made use of in the ephod, girdle, breastplate see ( Exodus 39:3 ) and had a mystical significance in them.