To me belongeth vengeance and recompence; their foot shall slide in due time: for the day of their calamity is at hand, and the things that shall come upon them make haste.

Wesley's Notes

32:35 Their feet shall slide - They who now think they stand fast and unmoveable, shall fall into utter destruction. In due time - Though not so soon as some may expect, yet in that time when it shall be most proper, when they have filled up the measure of their sins. At hand - Heb. is near. So the scripture often speaks of those things which are at many hundred years distance, to signify, that though they may be afar off as to our measures of time, yet in God's account they are near, they are as near as may be, when the measure of their sins is once full, the judgment shall not be deferred.

Matthew Henry's Concise Commentary

32:26-38 The idolatry and rebellions of Israel deserved, and the justice of God seemed to demand, that they should be rooted out. But He spared Israel, and continues them still to be living witnesses of the truth of the Bible, and to silence unbelievers. They are preserved for wise and holy purposes and the prophecies give us some idea what those purposes are. The Lord will never disgrace the throne of his glory. It is great wisdom, and will help much to the return of sinners to God, seriously to consider their latter end, or the future state. It is here meant particularly of what God foretold by Moses, about this people in the latter days; but it may be applied generally. Oh that men would consider the happiness they will lose, and the misery they will certainly plunge into, if they go on in their trespasses! What will be in the end thereof? Jer 5:31. For the Lord will in due time bring down the enemies of the church, in displeasure against their wickedness. When sinners deem themselves most secure, they suddenly fall into destruction. And God's time to appear for the deliverance of his people, is when things are at the worst with them. But those who trust to any rock but God, will find it fail them when they most need it. The rejection of the Messiah by the Jewish nation, is the continuance of their ancient idolatry, apostacy, and rebellion. They shall be brought to humble themselves before the Lord, to repent of their sins, and to trust in their long-rejected Mediator for salvation. Then he will deliver them, and make their prosperity great.