'Strengthen' in the Bible

Samson called to Yahweh, and said, "Lord Yahweh, remember me, please, and strengthen me, please, only this once, God, that I may be at once avenged of the Philistines for my two eyes."

It happened on the fourth day, that they arose early in the morning, and he rose up to depart: and the young lady's father said to his son-in-law, "Strengthen your heart with a morsel of bread, and afterward you shall go your way."

He arose early in the morning on the fifth day to depart; and the young lady's father said, "Please strengthen your heart and stay until the day declines;" and they both ate.