Were gone up (ανεβησαν). Second aorist active indicative of αναβαινω, not past perfect though the action is antecedent in fact to …

But when his brethren were gone up, then went he also up unto the feast. The words “unto the feast” are misplaced in the Received Text, on…

When he had said these words unto them, he abode still in Galilee. But when his brethren were gone up, then went he also up unto the feast, not…

Theophylact of Ohrid: Our Lord at first declares that He will not go up to the feast—I go not up with you—to avoid…

Jesus did not plan to go immediately to Jerusalem; he would wait until “the right time.” His brothers may have intended to make a show of his arriv…

But when his brethren were gone up
To the feast, as all the Oriental versions read, from the next clause: