“But you do not believe!
Because you do not belong
To my sheep.”
ἀλλὰ ὑμεῖς οὐ πιστεύετε, ὅτι οὐκ ἐστὲ ἐκ τῶν προβάτων τῶν ἐμῶν.
John uniquely indicated that they did not believe Jesus (ἀλλὰ ὑμεῖς οὐ πιστεύετε) because they did not belong to his sheep (ὅτι οὐκ ἐστὲ ἐκ τῶν προβάτων τῶν ἐμῶν). Pure and simple. They did not believe in Jesus because they were not part of his flock of sheep. They were the non-believers, not his sheep. Do you belong to a group with a negative attitude?