Leviticus 27:8 in the King James Version
But if he be poorer than thy estimation, then he shall present himself before the priest, and the priest shall value him; according to his ability that vowed shall the priest value him.
Context
7 If the person is from sixty years old and upward; if he is a male, then your valuation shall be fifteen shekels, and for a female ten shekels.
8 But if he is poorer than your valuation, then he shall be set before the priest, and the priest shall assign a value to him. The priest shall assign a value according to his ability to pay.
9 “‘If it is an animal of which men offer an offering to the LORD, all that any man gives of such to the LORD becomes holy.