Exodus 38:26-27

This silver came from the tax collected from each man registered in the census. (The tax is one beka, which is half a shekel, based on the sanctuary shekel.) The tax was collected from 603,550 men who had reached their twentieth birthday. The hundred bases for the frames of the sanctuary walls and for the posts supporting the inner curtain required 7,500 pounds of silver, about 75 pounds for each base.