Matthew Poole and continuators on John 13:11

11 For he knew who should betray him, therefore said he, Ye are not all clean .

By these words, the Evangelist expounds onely what our Saviour meant in the former verse, when he had told them, they were not all clean; for tho the Disciples did not yet know that they had a Traytor amongst them, Satan had before this, put the design into the heart of Iudas, ver. 2. and Christ who knew all hearts, knew what was in the heart of Iudas, and he soon after (as we shall hereafter in this Chapter read) revealed it; yet at this time he had not revealed it to his Disciples: Now he begins to discover it, telling them, that tho the most of them were clean, justified, and sanctified, yet all of them were not so.

Marginal references: Chap. 6.64.