Adam Clarke on Psalms 12:5

For the oppression of the poor - This seems to refer best to the tribulations which the poor Israelites suffered while captives in Babylon. The Lord represents himself as looking on and seeing their affliction; and, hearing their cry, he determines to come forward to their help.

Now will I arise - I alone delivered them into the hands of their enemies, because of their transgressions; I alone can and will deliver them from the hands of their enemies; and the manner of their deliverance shall show the power and influence of their God.

From him that puffeth at him - Here is much interpolation to make out a sense. Several of the versions read, "I will give him an open salvation." My work shall be manifest.