Mishnayos Peah Perek 3 Mishnah 8

הכותב כל נכסיו לעבדו – that he wrote, “all my property to so-and-so my slave,” for the slave is include in the property and he (the owner) gave him his selfhood and that which when it states, “my slave” that is my slave that was already.

שייר קרקע כל שהוא לא יצא בן חורין – all where he puts down a measurement, we say that he also left to himself, and when he said: “all my property is yours,” he is speaking of the rest of his property, but he deceived him that he came and not to free him. Since he (i.e., the owner) did not say to him “yourself and my property, and even if he doesn’t have any property other than the slave and the land that he left, nevertheless, he (i.e., the slave) does not go out to freedom, for since the word “all my property” is not fulfilled, for it comes as “except for” and he annuls it and we don’t argue his words and they are completely annulled, and he (i.e., the slave) did not acquire his self-food nor the property.

ר"ש אומר לעולם הו בן חורין – whether he has no property other than the slave and the land that he left, or whether he has other property, he (i.e., the slave) is always a free man, and we establish the word, “all my property” with the slave alone, when he doesn’t have other property, and we don’t say when he said, “except for,” this nullifies his word that he said, “all my property,” for we separate his word, and we fulfill him regarding his slave and he goes out as a free man.

חוץ מאחד מרבוא – and he didn’t explain what he leaves aside, but there we said that one-ten-thousandth part that he said, is the servant, and he is not considered other than one of one-ten-thousandth of his property and even though he is worth more, but the Halakha is not according to Rabbi Shimon.