כָּ֣כָה יֵעָשֶׂ֗ה לַשּׁוֹר֙ הָֽאֶחָ֔ד א֖וֹ לָאַ֣יִל הָאֶחָ֑ד אֽוֹ־לַשֶּׂ֥ה בַכְּבָשִׂ֖ים א֥וֹ בָעִזִּֽים׃
Demikianlah harus dilakukan untuk setiap ekor lembu jantan, atau untuk setiap ekor domba jantan, atau untuk setiap ekor anak domba atau anak kambing.
Bartenura
כבשים קודמים לעזים – in every place, Scripture advanced lambs t goats, as it is written (Exodus 12:5): “[Your lamb shall be without blemish, a yearling male;] you may take it from the sheep or from the goats,” and similarly, (Numbers 15:11): “[Thus shall be done with each ox, with each ram,] and with any sheep or goat.” It is possible that the person who says, “This burnt-offering is upon me,” and he has and he has a male lamb or a goat, he should bring the lamb, specifically.
Siftei Chakhamim
From here they derive that even a one-dayold ram is called איל... [You might ask:] Doesn’t Rashi comment on Bamidbar 15:11 that if it is under a year old it is called כבש, and only after 13 months it is called איל? [The answer is:] That is true only in regard to sacrifices. See Tosafos, Bava Kama 65b.