The Ballad of Jephthah

Hamlet: O Jephthah, judge of Israel, what a treasure hadst thou!

Polonius: What a treasure had he, my lord?

Hamlet: Why--
"One fair daughter, and no more,
The which he loved passing well."

Judges 11:30-31, and 11:34-35

30 And Jephthah vowed a vow unto the Lord, and said, If thou shalt without fail deliver the children of Ammon into mine hands, 31 Then it shall be, that whatsoever cometh forth of the doors of my house to meet me, when I return in peace from the children of Ammon, shall surely be the Lord's, and I will offer it up for a burnt offering.

34 And Jephthah came to Mizpeh unto his house, and behold, his daughter came out to meet him with timbrels and with dances: and she was his only child; beside her he had neither son nor daughter. 35 And it came to pass, when he saw her, that he rent his clothes, and said, Alas, my daughter, thou hast brought me very low, and thou art one of them that trouble me: for I have opened my mouth unto the Lord, and I cannot go back.