'Strengthen Your Heart' in the Bible

On the fourth day they got up early in the morning, and the Levite prepared to leave; but the girl’s father said to his son-in-law, “Strengthen yourself with a piece of bread, and afterward go your way.”

On the fifth day he got up early in the morning to leave, but the girl’s father said, “Please strengthen yourself, and wait until the end of the day.” So both of them ate.

I have sent him to you for this very purpose, so that you may know how we are, and that he may comfort and encourage and strengthen your hearts.