Numbers 28:21 Midrash

עִשָּׂר֤וֹן עִשָּׂרוֹן֙ תַּעֲשֶׂ֔ה לַכֶּ֖בֶשׂ הָאֶחָ֑ד לְשִׁבְעַ֖ת הַכְּבָשִֽׂים׃

a several tenth part shalt thou offer for every lamb of the seven lambs;

Read midrashic interpretation of Numbers 28:21: and classical rabbinic exegesis.