Therefore hath the LORD watched upon the evil, and brought it upon us: for the LORD our God is righteous in all his works which he doeth: for we obeyed not his voice.
Therefore hath the Lord watched upon the evil - expressing ceaseless vigilance, that His people's sins might not escape His judgment, as a watchman on guard night and day (Job 14:16; Jeremiah 31:28; Jeremiah 44:27). God watching upon the Jews' punishment, so as to bring it upon them, forms a striking contrast to the Jews' slumbering in their sins.
For the Lord our God is righteous. True penitents "justify" God, "ascribing righteousness to Him," instead of For the Lord our God is righteous. True penitents "justify" God, "ascribing righteousness to Him," instead of complaining of their punishment as too severe (Nehemiah 9:33; Job 36:3; Psalms 51:4; Lamentations 3:39-42).