Adam Clarke on Isaiah 66:18

For I know their works - A word is here lost out of the present text, leaving the text quite imperfect. The word is יודע yodea, knowing, supplied from the Syriac. The Chaldee had the same word in the copy before him, which he paraphrases by קדמי גלן kedemi gelon, their deeds are manifest before me; and the Aldine and Complutensian editions of the Septuagint acknowledge the same word επισταμαι, which is verified by MS. Pachom. and the Arabic version. I think there can be little doubt of its being genuine. The concluding verses of this chapter refer to the complete restoration of the Jews, and to the destruction of all the enemies of the Gospel of Christ, so that the earth shall be filled with the knowledge and glory of the Lord. Talia saecla currite! Lord, hasten the time!

It shall come "And I come" - For באה baah, which will not accord with any thing in the sentence, I read בא ba, with a MS.; the participle answering to יודע yodea, with which agree the Septuagint, Syriac, and Vulgate. Perhaps it ought to be ובא veba, when I shall come, Syr.; and so the Septuagint, according to Edit. Ald. and Complut., and Cod. Marchal.