Psalms 4:4

"Stand in awe, and sin not: commune with your own heart upon your bed, and be still. Selah."
Psalms 4:4 (KJV)

Context from Psalms 4

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.

6

There be many that say, Who will shew us any good? LORD, lift thou up the light of thy countenance upon us.