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Where does the Bible say “seek ye first the kingdom of God”?

It is in Matthew 6:33 · King James Version

“But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.”
Read the chapter Matthew 6 →

See also

Luke 12:31

But rather seek ye the kingdom of God; and all these things shall be added unto you.

Colossians 3:2

Set your affection on things above, not on things on the earth.