1 Kings 19:7

Revised Standard Version (RSV-CI)

And the angel of the Lord came again a second time, and touched him, and said, “Arise and eat, else the journey will be too great for you.”

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And he looked, and behold, there was at his head a cake baked on hot stones and a jar of water. And he ate and drank, and lay down again.

And he arose, and ate and drank, and went in the strength of that food forty days and forty nights to Horeb the mount of God.

Your bars shall be iron and bronze; and as your days, so shall your strength be.