Prayer for Mercy in the Time of Trouble

Psalm 4:1-5

1  To the chief Musician on Neginoth, A Psalm of David. Hear me when I call, O God of my righteousness: thou hast enlarged me when I was in distress; have mercy upon me, and hear my prayer. 
2  O ye sons of men, how long will ye turn my glory into shame? how long will ye love vanity, and seek after leasing? Selah. 
3  But know that the LORD hath set apart him that is godly for himself: the LORD will hear when I call unto him. 
4  Stand in awe, and sin not: commune with your own heart upon your bed, and be still. Selah. 
5  Offer the sacrifices of righteousness, and put your trust in the LORD.