A.T. Robertson Commentary John 7:3

"His brethren therefore said unto him, Depart hence, and go into Judaea, that thy disciples also may behold thy works which thou doest." — John 7:3 (ASV)

His brethren (ο αδελφο αυτου). "His brothers" (half-brothers actually), who "were not believing on him" (ουδε επιστευον εις αυτον) as stated in verse 5. They were hostile to the Messianic assumptions of Jesus, a natural attitude as one can well see, though at first they were friendly (2:12).

Depart hence (μεταβηθ εντευθεν). Second aorist active imperative of μεταβαινω, to pass to another place (5:24; 13:1). It was impertinence on their part.

That thy disciples also may behold (ινα κα ο μαθητα σου θεωρησουσιν). Final clause with ινα and the future active indicative of θεωρεω. Jesus had many disciples in Judea at the start (2:23; 4:1) and had left it because of the jealousy of the Pharisees over his success (4:3). The brothers may have heard of the great defection in the synagogue in Capernaum (6:66), but the advice is clearly ironical.

Which thou doest (α ποιεις). To what works they refer by this language we do not know. But Jesus had been away from Galilee for some months and from Judea for a year and a half. Perhaps the brothers of Jesus may actually have been eager to rush Jesus into the hostile atmosphere of Jerusalem again.