Beitzah 7B

דשמעה קליה ביממא.

where the hen can hear its voice by day, when sounds cannot be heard as easily as at night. If the chicken is close enough to hear the rooster’s call by day, the rooster is considered close enough to the chicken that the latter will produce eggs only through fertilization by the male.

עבד רב מרי עובדא עד שתין בתי.

The Talmud relates: Rav Mari took action in accordance with this opinion, when he found an egg on a Festival morning after he had looked in the nest the day before and failed to find an egg there. He examined up to a distance of 60 houses from the chicken, and although he did not find a rooster within this area, he assumed there was one further away and permitted the egg.

ואי איכא נהרא ⁠— לא עברא. ואי איכא מברא ⁠— עברא. ואי איכא מיצרא ⁠— לא עברא. הוה עובדא, ועברא אמיצרא.

The Talmud comments: And if there is a river between the rooster and the chicken, the chicken does not cross the river; but if there is a bridge, it crosses the river. And if there is only a rope bridge suspended across the river, the chicken will not cross on the rope. The Talmud comments: Nevertheless, an incident occurred in which a chicken crossed over on a rope bridge. However, one may not rely on this possibility.

במאי אוקימתא ⁠— בדספנא מארעא, מאי איריא בדק? כי לא בדק נמי!

The Talmud further asks: In what manner did you establish this halakha of R' Yosei ben Shaul, who prohibits eating an egg discovered in a nest on a Festival morning after the previous day’s examination revealed nothing? You said that it is referring to a case in which the chicken absorbed from the earth. If so, why discuss specifically a situation in which one examined the nest the evening before? The same halakha should apply even when one did not examine the nest beforehand.