Are these sentences grammatically correct?
We don't have to worry about our needs, if we believe in Jesus.
Jesus promises that our needs will be supplied, if we seek first the kingdom of God and His righteousness.
God is our provider, and living without anxiety is the reward for our faith in God’s promises.

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These sentences are exactly correct. And "supplied" is the correct word here.

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I agree, these sentences are correct.

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Good remembrance, thank you very much!

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The sentences are correct grammatically, but no comma before "if" when the clause is the end of the sentence . If it's at the beginning ,then use comma .

We don't have to worry about our needs if we believe in Jesus. =
If we believe in Jesus , we don't have to worry about our needs.

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i agree too , those sentences grammatically correct