Numbers 29:15 Midrash

וְעִשָּׂרׄוֹן֙ עִשָּׂר֔וֹן לַכֶּ֖בֶשׂ הָאֶחָ֑ד לְאַרְבָּעָ֥ה עָשָׂ֖ר כְּבָשִֽׂים׃

and a several tenth part for every lamb of the fourteen lambs;

Read midrashic interpretation of Numbers 29:15: and classical rabbinic exegesis.