Eruvin 51B

עני הוא דאקילו רבנן עילויה, אבל עשיר ⁠— לא.

Therefore, it is only with regard to a pauper, who does not have food for two meals, that the rabbis were lenient and permitted him to establish residence merely by saying: My residence is in my current location. However, with regard to a wealthy person in his own house who has bread, no, they did not permit him to do so.

ורבי יהודה סבר: עיקר עירוב ברגל, אחד עני ואחד עשיר. אבל ״במקום פלוני״⁠ — דברי הכל: עני ⁠— אין, עשיר ⁠— לא.

And R' Yehuda maintains: The primary ordinance of eiruv is by foot, i.e., by going and stating that he is establishing his residence in that location, and therefore it applies to both a pauper and a wealthy person. However, with regard a case when the person said: My residence is in such-and-such place, and he is not there, everyone, both R' Meir and R' Yehuda, agrees that for a pauper on the road on a Friday, yes, an eiruv may be established in that manner; however, for a wealthy person, no, an eiruv may not be established in that manner.

״וזו היא שאמרו״ מאן קתני לה ⁠— רבי מאיר. ואהייא קאי ⁠— א״אינו מכיר או שאינו בקי בהלכה״. ״ולא אמרו מערבין בפת אלא להקל״ מאן קתני לה ⁠— רבי יהודה.

And as for the Mishnah’s statement: And this is what the rabbis meant when they said that a pauper can establish an eiruv with his feet, who, which Sage, is teaching it? It is R' Meir. And to which clause of the Mishnah is it referring? It refers to the previous statement: If he is not familiar with a tree or any other noticeable landmark, or if he is not an expert in the halakha, and therefore is unaware that a residence can be established from a distance, and said: My residence is in my current location, he acquires 2,000 cubits in each direction. And as for the statement in the continuation of the Mishnah: The rabbis said that one establishes an eiruv with bread only to be lenient with the wealthy person, who, which Sage, is teaching it? It is R' Yehuda, who maintains that the option of establishing an eiruv by foot is available to the wealthy as well.