A.T. Robertson Commentary John 10:8

"All that came before me are thieves and robbers: but the sheep did not hear them." — John 10:8 (ASV)

Before me (προ εμου). Aleph with the Latin, Syriac, and Sahidic versions omit these words (supported by A B D L W). But with or without προ εμου Jesus refers to the false Messiahs and self-appointed leaders who made havoc of the flock. These are the thieves and robbers, not the prophets and sincere teachers of old. The reference is to verse 1. There had been numerous such impostors already (Josephus, Ant. XVIII. i. 6; War II. viii. I) and Jesus will predict many more (Matthew 24:23f.). They keep on coming, these wolves in sheep's clothing (Matthew 7:15) who grow rich by fooling the credulous sheep. In this case "the sheep did not hear them" (ουκ ηκουσαν αυτων τα προβατα). First aorist active indicative with genitive. Fortunate sheep who knew the Shepherd's voice.