Nehemiah 10:31-32

31 aAnd if the peoples of the land bring in goods or any grain on the Sabbath day to sell, we will not buy from them on the Sabbath or on a holy day. And we will forego the crops of the bseventh year and the cexaction of every debt.

32“We also take on ourselves the obligation to give yearly da third part of a shekel
A  shekel was about 2/5 ounce or 11 grams
for the service of the house of our God:
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