כִּֽי־כֹה֙ אָמַ֣ר יְהוָ֔ה חִנָּ֖ם נִמְכַּרְתֶּ֑ם וְלֹ֥א בְכֶ֖סֶף תִּגָּאֵֽלוּ׃
因為永恆者如此說：「你們是白白被賣的，也必不用銀子被贖回。」
Rashi
You were sold for nought Because of worthless matters, i.e., the evil inclination, which affords you no reward.
Ibn Ezra
You have been sold, etc. I have sold you to the nations without receiving money for you, and so will I redeem you without giving money for you.