Again there was division among the Jews because of Jesus’ message.
19. A division therefore arose again. The advantage gained by Christ’s discourse was, that it procured him some disciples; but as his doctrine has also many adversaries, hence arises a division, so that they are split into parties, who formerly appeared to be one body of the Church.
We have here an account of the people's different sentiments concerning Christ, on occasion of the foregoing discourse; there was a division, a schism, among them; they differed in their opinions, which threw them into heats and parties. Such a ferment as this they had been in before (Joh 7:43; Joh 9:16); and where there has once been a division again. Rents are sooner made than made up or mended.
Commenting on John 10:19-21
There was a division therefore again among the Jews,.... As there had been before; see Joh 7:12. For these sayings; concerning his being the good shepherd, and laying down his life for the sheep, and having both a power to lay it down, and take it up again.