Bilangan 3:49

3:49 So Moses took the redemption money ¹  from those who were in excess of those redeemed by the Levites.

Bilangan 35:31

35:31 Moreover, you must not accept a ransom for the life of a murderer who is guilty of death; he must surely be put to death.

[3:49]  ¹ sn The word used is “silver.” Coins were not in existence until after 700 b.c. (starting with Lydia).