For the voice of him ... - That is, Because I hear the voice of him that reproaches and blasphemes. The word rendered blasphemeth, means properly to use cutting words; then, to reproach or revile. It may be applied either to people or to God. In the former case, it means reproach or reviling; in the latter, blasphemy in the usual sense of that term, denoting reproachful words concerning God. The word may be used here in both these senses, as it is evident that not only were the people the subject of reproach, but that God was also.
By reason of the enemy - That is, the foreign enemies, or those who had invaded the land.
And avenger - Of him who had come to take vengeance. Here the word refers to the foreign enemies of the nation, and to the spirit by which they were actuated; their purposes to avenge themselves of what they regarded as wrongs, or take vengeance on a nation which they had long hated. Compare the notes at Psalms 8:2.