A gerah (Hebrew: גרה‎) is an ancient Hebrew unit of weight and currency, which, according to the Bible, Exodus, 30:13, was equivalent to 1/20 of a shekel. God tells Moses, the payment for life ransom during the census taking is 1/2 a shekel, "which weighs ten gerahs". This would make a whole shekel equal to 20 gerahs. The Jerusalem Talmud Shekalim, in the Mishnah, debates if a kalbon, which was added when annually giving a half shekel to the Temple, was a "ma'ah" or a "chatzi ma'ah" (half ma'ah).