Silver is symbolic of Redemption
The redemption of the firstborn was to be paid for in silver half shekels.
The LORD said to Moses, “When you take the census of the people of Israel, then each shall give a ransom for himself to the LORD when you number them, that there be no plague among them when you number them. Each who is numbered in the census shall give this: half a shekel according to the shekel of the sanctuary (the shekel is twenty gerahs), half a shekel as an offering to the LORD. Every one who is numbered in the census, from twenty years old and upward, shall give the LORD’s offering. The rich shall not give more, and the poor shall not give less, than the half shekel, when you give the LORD’s offering to make atonement for yourselves. And you shall take the atonement money from the people of Israel, and shall appoint it for the service of the tent of meeting; that it may bring the people of Israel to remembrance before the LORD, so as to make atonement for yourselves.” Ex. 30:11-16
All that opens the womb is mine, all your male cattle, the firstlings of cow and sheep. The firstling of an ass you shall redeem with a lamb, or if you will not redeem it you shall break its neck. All the first-born of your sons you shall redeem. And none shall appear before me empty. Ex. 34:19-20
You know that you were ransomed from the futile ways inherited from your fathers, not with perishable things such as silver or gold, but with the precious blood of Christ, like that of a lamb without blemish or spot. He was destined before the foundation of the world but was made manifest at the end of the times for your sake. 1 Pet. 1:18-20
FYI:
- Joseph was sold for silver [Gen 37:28]
- Slaves were sold for silver [Ex 21:32]
- Jesus was sold for silver [Mat 27:1-9; Zech 11:12-13]