Prayer for God to Avenge His People

Psalm 94:1-7

1  O LORD God, to whom vengeance belongeth; O God, to whom vengeance belongeth, shew thyself. 
2  Lift up thyself, thou judge of the earth: render a reward to the proud. 
3  LORD, how long shall the wicked, how long shall the wicked triumph? 
4  How long shall they utter and speak hard things? and all the workers of iniquity boast themselves? 
5  They break in pieces thy people, O LORD, and afflict thine heritage. 
6  They slay the widow and the stranger, and murder the fatherless. 
7  Yet they say, The LORD shall not see, neither shall the God of Jacob regard it.