פירוש על עבודה זרה 113:6

Shimi raises an objection against Rav. This baraita deals with two types of slaves—those bought from a non-Jew and those born into a Jewish house. Until these slaves are circumcised (if male) and immersed, they are considered non-Jews. Thus they convey impurity. However, others consider them to be pure. This section is not directly related to the issue at hand.