John Gill Commentary Ezekiel 16:57

"before thy wickedness was uncovered, as at the time of the reproach of the daughters of Syria, and of all that are round about her, the daughters of the Philistines, that do despite unto thee round about." — Ezekiel 16:57 (ASV)

Before your wickedness was discovered
By the punishment of it, by the judgments of God brought upon them; then they were humbled, who before were proud and haughty; and might speak and think of the vengeance of God on Sodom, which before they made no mention of. It is a sad thing only to know sin, and to have it discovered only by the punishment of it:

as at the time of [your] reproach of the daughters of Syria, and all
[that are] round about her, the daughters of the Philistines ;
this seems to refer to the times of Ahaz, when the Syrians smote the men of Judah; and carried many of them captive; and the Philistines invaded the cities of the low country, and southern parts of Judah, and took many of them, (2 Chronicles 28:5 2 Chronicles 28:18) ; at which time the wickedness of the Jews was discovered; and it was a plain case they had sinned against the Lord, by his suffering their enemies to come upon them, and prevail over them; which was to their reproach.

The Syrians reproached them, and so did the Philistines: which despise you round about ;
they spoiled and plundered them on all sides; and treated them with scorn and contempt, who before were formidable and terrible to them: thus it is with a people when they are left of God, they are despised by men.