Here the Lord seems to refer to the prediction, when the fulfillment arrives. As if the Lord had said, "Let such as behold the desolations here spoken of look back, and mark how I predicted them, and how faithfully my word is accomplished." It is a solemn truth, though but seldom regarded as it ought, that, the very name of Jehovah Aloheim, (God in covenant) implies, that the Lord is, and will be, equally true to his threatenings, as to his promises: for all shall prove him the faithful God; Deuteronomy 7:9-10.
Related Commentaries of Isaiah 34:16
Isaiah 34:16-17
16 Seek ye out of the book of the LORD, and read: no one of these shall fail, none shall want her mate: for my mouth it hath commanded, and his spirit it hath gathered them.
17 And he hath cast the lot for them, and his hand hath divided it unto them by line: they shall possess it for ever, from generation to generation shall they dwell therein.