John 13:18 - Coke's Commentary on the Holy Bible

I know whom I have chosen:— Christ does not intend to say here, that he had chosen some of his apostles, and not all; for he owns that he had chosen Judas, by saying, Have not I chosen you twelve, and one of you is a devil? John 6:70. The import of these words seems therefore to be this, "I know the temper, disposition, and hearts of those whom I have chosen, and what one of them particularly will do; for which cause I said, Ye are not all clean; but God, in his wisdom, has permitted this: and, as Ahithophel betrayed David, though he was his familiar friend; so Judas, my familiar at my table, will betray the Son of God; and so the words recorded, Psalms 41:9 will be fulfilled in him also, of whom king David was the type."