John Gill

Your iniquities, and the iniquities of your fathers together (saith the Lord),.... That is, the punishment both of the one and of the other; these being alike, and continued from father to son, and approved of, and committed by one generation after another, till the measure was filled up; and then the recompence of reward is given for all of them together at once: which have burnt incense upon the mountains, and blasphemed me upon the hills; where they offered incense and other sacrifices to idols, which was interpreted by the Lord as a blaspheming and reproaching of him; see Isa 57:7, therefore will I measure their former work into their bosom; punish them for their former sins as well as their latter ones, and both together.