Exodus 12:44

ומלתה אתו אז יאכל בו WHEN THOU HAST CIRCUMCISED HIM THEN SHALL HE EAT THEREOF — “he” means his (the slave’s) master; this tells us that the neglect to circumcise his slaves bars him from eating of the Paschal offering. This is the opinion of R. Joshua. Rabbi Eliezer, however, said: the neglect to circumcise his slaves does not bar him from eating of the Paschal offering. The objection was raised: if this be so what means “Then shall he eat thereof”? — The reply was given: “He” means the slave, not the master (the meaning being that the slave, so long as he is uncircumcised may not eat of it) (cf. Mekhilta).

וְכׇל־עֶ֥בֶד אִ֖ישׁ מִקְנַת־כָּ֑סֶף וּמַלְתָּ֣ה אֹת֔וֹ אָ֖ז יֹ֥אכַל בּֽוֹ׃

but every man’s servant that is bought for money, when thou hast circumcised him, then shall he eat of it.