Who knows a tenth?

?עשירית - מי יודע

In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 0.1.

Lazy gematria may be worthy of discission, but perhaps not of a full-fledged answer. [This may not apply in the conventional sense, but, e.g., saying x is a quarter of y is just not keeping in the spirit. However, there maybe be examples that the Arizal, Baal Haturim, etc., mention and they are perfect for comments.]

Check out for the previous three hundred fifty entries in this ongoing series.

Please include sources for your information wherever possible, as with all other answers on this site.


You shall set aside every year a tenth part of all the yield of your sowing that is brought from the field. [Devarim 14:22]


This stone which I have set [as] a monument will become a House of God and of all that You give, I will surely give a tenth to You. [Genesis 28:22]


And [Abram] gave him a tenth of everything. [Genesis 14:20]


The omer is a tenth of an ephah. [Exodus 16:36]


He will take a tenth part of your grain and vintage and give it to his eunuchs and courtiers. [1 Samuel 8:15]


The amount of charity one should give is as follows: if one can but afford, let him give as much as is needed. Under ordinary circumstances, a fifth of one's property is most laudable. To give one-tenth is the average disposition. But to give less than one-tenth is niggardly. When the Rabbis said a "fifth" they meant a fifth of the property the first year only and a fifth of the profits in succeeding years. [Shulchan Arukh, Yoreh De'ah 249:1]

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