וְהִקְרַבְתֶּ֨ם עוֹלָ֜ה לְרֵ֤יחַ נִיחֹ֙חַ֙ לַֽיהוָ֔ה פָּרִ֧ים בְּנֵי־בָקָ֛ר שְׁנַ֖יִם אַ֣יִל אֶחָ֑ד שִׁבְעָ֥ה כְבָשִׂ֖ים בְּנֵ֥י שָׁנָֽה׃
און איר זאָלט מקריבֿ זײַן אַ בראַנדאָפּפֿער פֿאַר אַ געשמאַקן ריח צו גאָט: צװײ יונגע אָקסן, אײן װידער, זיבן שעפּסן יאָריקע.
Mishneh Torah, Daily Offerings and Additional Offerings
If they only found two sheep – and if they were to offer them for today’s musaf there would not be enough for tomorrow’s tamid – both options are equally valid. If they offered them for today’s musaf, it is valid, and if they wanted to leave them for tomorrow’s tamid offerings, they could do so.
Mishneh Torah, Positive Mitzvot
To bring an additional offering on the Feast of Weeks, as it is said, “Also on the day of the first fruits…. ye shall bring a burnt-offering for a sweet savour” (Num. 28:26-27).