Exodus 30:13-15
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13This is what everyone who is counted shall give: half a shekel according to the shekel of the sanctuary (the shekel is twenty gerahs), half a shekel as a contribution to the Lord. 14Everyone who is counted, from twenty years old and over, shall give the contribution to the Lord. 15The 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.