1 Samuel 17:16

New International Version

For forty days the Philistine came forward every morning and evening and took his stand.

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where for forty days he was tempted by the devil. He ate nothing during those days, and at the end of them he was hungry.

After fasting forty days and forty nights, he was hungry.

but David went back and forth from Saul to tend his father’s sheep at Bethlehem.

Now Jesse said to his son David, “Take this ephah of roasted grain and these ten loaves of bread for your brothers and hurry to their camp.