Exodus 30:13-15

American Standard Version

¹³ This they shall give, every one that passeth over unto them that are numbered: half a shekel after the shekel of the sanctuary (the shekel is twenty gerahs), half a shekel for an offering to Jehovah. ¹⁴ Every one that passeth over unto them that are numbered, from twenty years old and upward, shall give the offering of Jehovah. ¹⁵ The rich shall not give more, and the poor shall not give less, than the half shekel, when they give the offering of Jehovah, to make atonement for your souls.