μὴ πιστεύσητε τοῖς ἀμαθεστέροις ὑμῶν αὐτῶν → do not believe those who are more ignorant than you yourselves
genitive case plural masculine or neuter of οὗτος; of (from or concerning) these (persons or things): such, their, these (things), they, this sort, those.