Numbers 29:10 Midrash

עִשָּׂרוֹן֙ עִשָּׂר֔וֹן לַכֶּ֖בֶשׂ הָאֶחָ֑ד לְשִׁבְעַ֖ת הַכְּבָשִֽׂים׃

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