Expositor's Bible Commentary Commentary John 9:34

"They answered and said unto him, Thou wast altogether born in sins, and dost thou teach us? And they cast him out." — John 9:34 (ASV)

To this argument the Jews had no real answer, so they attacked the man by character assassination and made him feel unworthy to answer. Then they excommunicated him, thus isolating him from his family and friends and debarring him from employment (cf. v.22).