Hebrews 6:17-18
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17Wherein God, being determined to show more abundantly to the heirs of the promise the immutability of his counsel, interposed with an oath; 18that by two immutable things, in which it is impossible for God to lie, we may have a strong encouragement, who have fled for refuge to take hold of the hope set before us,
Hebrews 6:17-18 (WEB)