(Beraisa - R. Chalafta ben Sha'ul): One who is Otesh (emits air) in his Tefilah, this is a bad Siman for him.

Limitation: This refers to below (passing gas), but above (sneezing), no. (Sneezing is a good Siman - MAHARA FULDA.)

This is like R. Chanina said - I saw Rebbi yawn and sneeze [during Tefilah], and he put his hand over his mouth (when he yawned).

One may not spit [during Tefilah].

(R. Yochanan): One may even spit, so his mouth will be empty.

In front of oneself, one may not [spit]. In back, it is permitted. To his right, it is forbidden. To his left, it is permitted.

Source: "Yipol mi'Tzidcha Elef (and 10,000 on your right side"; this shows that the right is more important).

All agree that one may spit into his garment.

(R. Yehoshua ben Levi): One who spits in a Beis ha'Keneses, he is like one who spits in [Hash-m's] eye.

R. Yonah spat [not at the time of Tefilah - R. SHLOMO SIRILIYO], and mashed it [with his foot].

(R. Yirmeyah citing R. Shmuel bar Chalafta citing Rav Ada bar Achavah): One who prays may not spit until he goes four Amos.

(R. Yosi bei R. Avun): Similarly, one who spits may not pray until he goes four Amos.

(Beraisa): One who prays may not urinate until he goes four Amos. Similarly, one who urinates may not pray until he goes four Amos.

(R. Yakov bar Acha): This is not only until he goes four Amos, rather, even if he delays long enough to walk four Amos.

Support (R. Ami): If you would say that it until he goes four Amos, he is forbidden, I can say that someone else urinated [or spat - HA'GAON RAV C. KANIEVSKY, SHLITA] there (where he is now. If so, he cannot pray anywhere where someone might have urinated or spat! Rather, surely it means until he delays enough to walk four Amos.)

(R. Aba citing Rav): [One may not pray near] excrement, until it is dry like a bone. [One may not pray near] urine, as long as [it is moist enough so] it can wet [what touches it].

(Geneiva): [One may not pray near] urine, as long as its impression is recognized (where it was absorbed into the ground).

(Shmuel): [One may not pray near excrement] until its surfaces form a crust.

Support (Shimon bar Va, citing R. Yochanan): [One may not pray near excrement] until its surfaces form a crust.

(R. Yirmeyah citing R. Ze'ira citing Rav): Excrement, it is forbidden [to pray near it] even if it is [dry] like a bone.

(Shmuel, and Shimon bar Va, citing R. Yochanan): [It is forbidden] until its surfaces form a crust.

Question (Chizkiyah): R. Aba is more stringent about urine than excrement!

Question (R. Mana): (Why do you think to permit urine, even if it can wet what touches it?) From Geneiva [we find that urine forbids as long as its impression is recognized]!

Answer (Chizkiyah): (I agree with R. Aba's ruling about urine. I ask about his Heter for excrement.) Even if it is like a bone [it should be forbidden, like R. Yirmeyah said], for Mishmashah is intact (one can touch it, and it will not crumble). Urine (even if it can wet what touches it), Mishmashah is not intact (one is not touching the urine itself. We explained this like CHAREDIM.)