Exodus 30:15

The rich are not to give more than a half shekel and the poor are not to give less when you make the offering to the LORD to atone for your lives.

(New International Version)

'The rich shall not pay more and the poor shall not pay less than the half shekel, when you give the contribution to the LORD to make atonement for yourselves.

(New American Standard Bible)

The rich shall not give more, and the poor shall not give less than half a shekel, when they give an offering unto the LORD, to make an atonement for your souls.

(King James Version)