"When you take a census of the Israelis to register them, each is to give a ransom for himself to the LORD when they're registered so there won't be a plague among them when they're registered. This is what everyone who is registered is to give: half a shekel according to the shekel of the sanctuary (the shekel weighs 20 gerahs), half a shekel as a contribution to the LORD. All who are registered, 20 years of age and older, are to give a contribution to the LORD. read more.
The rich person is not to give more, nor is the poor person to give less than the half shekel, when you give a contribution to the LORD to make atonement for yourselves.