Tohoros 4:6-7
Tohoros 4:6
Let’s say that there were two types of saliva – one potentially unclean and the other ritually clean. Trumah is “suspended” if a person touched, carried or moved one of these in the private domain, touched one of them in the public domain while it was still wet, or carried it wet or dry in the public domain. If there was only one kind of saliva (i.e., potentially unclean) and someone touched, carried or moved it in a public domain, trumah is burned because of it. This is certainly the case if it was in a private domain.
Tohoros 4:7
The Sages ruled the following cases of doubt are ritually clean: a doubt regarding drawn water in a mikvah; a doubt regarding something unclean floating on the water; a doubt regarding whether liquids were rendered unclean is ruled unclean but a doubt regarding whether they conveyed impurity is ruled clean; a doubt regarding whether hands have been rendered unclean, conveyed impurity or been purified is ruled clean; a doubt that arose in a public domain; a doubt regarding rabbinic law; a doubt regarding non-sanctified food (chulin); a doubt regarding vermin; a doubt regarding negaim (tzaraas blemishes); a doubt regarding a nazirite vow; a doubt regarding first-borns; a doubt regarding sacrifices.