1 Samuel 7:8
And the sons of Israel said to Samuel, Cease not to cry unto the LORD our God for us that he will save us out of the hand of the Philistines.
Isaiah 37:4
It may be the LORD thy God will hear the words of Rabshakeh, whom the king of Assyria his master has sent to blaspheme the living God and to reprove with the words which the LORD thy God has heard; therefore lift up thy prayer for the remnant that is still left.
1 Samuel 12:19-24
And all the people said unto Samuel, Pray for thy slaves unto the LORD thy God that we not die, for we have added unto all our sins this evil, to ask for a king over us.
Isaiah 62:1
For Zion's sake I will not hold my peace; and for Jerusalem's sake I will not rest until her righteousness goes forth as brightness and her saving health is lit as a flaming torch.
Isaiah 62:6-7
I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night; ye that make mention of the LORD, do not keep silent
James 5:16
Confess your faults one to another and pray one for another that ye may be whole. The effectual prayer of the righteous is very powerful.