Shulchan Aruch
Chapter 7: The Law to Recite the
Blessing of Asher Yatzar Whenever One Uses the Restroom[1]
(4 Paragraphs)
1. Whenever one
takes care of his needs, whether water or solid[2]
he should say the blessing of Asher Yatzar (אשׁר יצר) but not אל נטילת
ידים. This applies even if one wants to learn or
pray immediately. [If one got his hands
dirty from wiping[3] with them,
none-the-less, he does not say the blessing of אל נטילת
ידים.[4]]
2. If one only passed water and did not get his hands unclean[5], none-the-less he is required to say the blessing of אשׁר יצר. One is not required to wash his hands in this case, but (should do so) because of cleanliness or because of preperation[6].
3. If one urinated
and forgot about it, then one urinated a second time, he is required to recite אשׁר
יצר twice.
4. There is no minimum requirement for urinating; even a small drop obligates one to say the blessing of אשׁר יצר. For if that hole was closed up, blocking anything form coming out, this would be a tremendous problem and one is required to give thanks to G-d.
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[1] Lit. “All day after passing water”
[2] Lit. “Small or big”
[3] Lit. “Rubbing”
[4] Even though one does repeat the blessing, he must wash his hands in the manner of נטילת ידים since his hands are unclean (both physically and spiritually).
[5] Lit. “And didn’t rub with them”
[6] I am unsure what “because of preparation” refers to. Perhaps he means preparation for eating. Alternatively, he is talking about preparing for praying or learning Torah and it is a sign of respect to wash your hands before praying or learning.