Do all things that are tamei have to be more than an adasha or just a sheretz? for example is less than an adasha of zera tamei?

  • 1
    Consider dejargonifying this. Consider also providing background for your statements. Where did you encounter adasha?
    – mevaqesh
    Commented Apr 21, 2017 at 20:28
  • See Hilkhot Shar Avot HaTum'ot (5:1-2) שכבת זרע--אב מאבות הטומאות... ב וכמה שיעורה--לנוגע, בכעדשה; ולרואה, בכל שהוא. To become impure by touching zera one would need the amount of an adasha. To become impure by ejaculating it, any amount would suffice.
    – mevaqesh
    Commented Apr 21, 2017 at 20:34
  • Welcome to MY! As @mevaqesh pointed out, we try to avoid jargon without explaining, and we try to insert sources for any of our statements. Hope to see you around!
    – DonielF
    Commented Apr 21, 2017 at 20:38
  • Welcome to Mi Yodeya Anonymous! Consider registering your account.
    – mevaqesh
    Commented Apr 21, 2017 at 20:50

1 Answer 1


There is no general rule. Some things need a minimum of a lentil's worth, some a barley's worth, some an olive's worth, etc. You just need to check each case. For example, check out Mishna Ahilot Chapter 2 for various minimum sizes related to corpse-impurity.

Regarding your specific example, yes, the minimum size of semen to impart impurity is a lentil's worth (Rambam Shear 5:2).

  • 1
    What is "Rambam Shear"? Commented Apr 21, 2017 at 23:28
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    @DavidKenner - I think he means She'ar Avot HaTum'ah by the Rambam.
    – ezra
    Commented Apr 22, 2017 at 0:14
  • @ezra sounds correct. TY. Then it should be 5:1. Commented Apr 23, 2017 at 1:10

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