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Where does the Bible say “be still, and know that I am God”?

It is in Psalms 46:10 · King James Version

“Be still, and know that I am God: I will be exalted among the heathen, I will be exalted in the earth.”
Read the chapter Psalms 46 →

See also

Psalms 46:1

To the chief Musician for the sons of Korah, A Song upon Alamoth. God is our refuge and strength, a very present help in trouble.

Psalms 46:11

The Lord of hosts is with us; the God of Jacob is our refuge. Selah.