וְאִם־גָּאֹ֖ל יִגְאָלֶ֑נָּה וְיָסַ֥ף חֲמִישִׁת֖וֹ עַל־עֶרְכֶּֽךָ׃
But if he will indeed redeem it, then he shall add the fifth part thereof unto thy valuation.
Read halakhic rulings (Jewish law) on Leviticus 27:13 from the Mishneh Torah and classical halakhic sources, free online.