וַיֹּאמְר֖וּ נָת֣וֹן נִתֵּ֑ן וַֽיִּפְרְשׂוּ֙ אֶת־הַשִּׂמְלָ֔ה וַיַּשְׁלִ֣יכוּ שָׁ֔מָּה אִ֖ישׁ נֶ֥זֶם שְׁלָלֽוֹ׃
And they answered: ‘We will willingly give them.’ And they spread a garment, and did cast therein every man the ear-rings of his spoil.
Read midrashic interpretation of Judges 8:25: and classical rabbinic exegesis.