One Who Needs to Urinate at the time of Recitation [of the Sh'ma], containing 1 Se'if
If one was reciting, and urine began flowing onto their knees, they should pause until the flow stops, and [then] return to recite - even if it fell on his garments and it had [enough] moisture to moisten [a surface which could in turn moisten another surface], since it is covered by one's clothing (ie. he had another layer of dry clothing on top of the wet one) [they can continue to recite]. And if urine fell on the ground, one should distance from it 4 amot. Rem"a: Or [they should distance themselves] the amount that will be clarified below in Siman 82, or one can wait until it is absorbed into the ground [The Ri, Chapter 2 of B'rachot] And even if one delayed enough to finish all of it [i.e. the recitation], there is no need to go back [in the recitation] other than to the place that one paused. Rem"a: And there are those who say that if one delayed enough to finish all of it, they must return to the beginning, and this is the main [position that one should follow] like what I wrote above in Siman 65. And it is calculated according to the [time it would take the particular] reader.