Mishnayos Negaim Perek 14 Mishnah 13

זאת שאלו אנשי אלכסנדריא את ר' יהושע – the second leper who is living, what happens to him, how can he become pure to eat Holy Things, for if the other leper were living, even though their [bird] sacrifices were mixed up, this one (i.e., Kohen) would offer up in the name of someone and the other (i.e., Kohen) would offer up in the name of someone. Or if one of them had died, and there were two sacrifices before us, there were the sacrifices of the dead and this one would offer the other sacrifice. But now, he is not able to offer this, for perhaps it is of the dead person and it the sin-offering of the person who owned it, and it went to death. But the other sacrifice he also is not able to bring, for perhaps the one that was offered was his and he is exempted, and it is found that he brings non-holy animals to the courtyard. And he is not able to make a condition with a free-will offering, for the sin-offering does not come as a free-will offering.

יכתוב נכסיו לאחר – for he is a poor person and it is appropriate to bring the sacrifice of a poor person, but the sin-offering of fowl comes on the doubt, and there isn’t anything in it because of non-holy offerings in the Courtyard. But if he doesn’t make his possessions ownerless and he brought the sin-offering of a fowl, he was not purified, for a rich person who brought a sacrifice of a poor person did not fulfill his obligation. But from the guilt-offering that he brings, one is not able to bring an raise a question about how one is able to bring a guilt-offering in a case of doubt, perhaps he brings non-holy animals to the Courtyard, for since his gifts for the guilt-offering are equivalent to the peace offerings, he can bring a guilt-offering and make a stipulation, if I am liable for a guilt offering, this should be for a guilt-offering, but if not, that my guilt offering was offering, this should be for a peace-offering, what he is not able to do regarding a sin-offering for the sprinkling/smearing of blood of a sin-offering is not equivalent to a peace offering, for the sprinkling of blood of a sin-offering [four “gifts”] is [sprinkled] above the red line (i.e., painted in red and encircling the Temple altar at precisely half its height), but peace offerings [of two “gifts”] is below the red line.