We may however understand that the other disciples thought or said the same, or that they assented to what Judas said, and thus Matthew and Mark have described their common consent. But Judas said it because he was a thief, the others out of their care for the poor; and John desired to mention it only in the case of him whose thievish propensity he thought ought to be recorded.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Cons. Ev., ii, 79