Various people are mentioned who are believed in particular situations to identify who is who – for ex. who is the first born, who bought the item from the store owner and who won a court case. In all these cases there is a time frame given for the identifier (midwife and mother in firstborn case, store owner and judge in the other 2 cases) Why did Abba Shaul call a shtuki “beduki“? A mishna which seems somewhat like the previous mishna is brought regarding people who are forbidden to marry within but are allowed to marry without. The gemara raises many questions on the mishna and several interpretations are brought which are then analyzed.