Reference for Menachot 12:3

הֲרֵי עָלַי מִנְחָה מִן הַשְּׂעֹרִין, יָבִיא מִן הַחִטִּים. קֶמַח, יָבִיא סֹלֶת. בְּלֹא שֶׁמֶן וּלְבוֹנָה, יָבִיא עִמָּהּ שֶׁמֶן וּלְבוֹנָה. חֲצִי עִשָּׂרוֹן, יָבִיא עִשָּׂרוֹן שָׁלֵם. עִשָּׂרוֹן וּמֶחֱצָה, יָבִיא שְׁנָיִם. רַבִּי שִׁמְעוֹן פּוֹטֵר, שֶׁלֹּא הִתְנַדֵּב כְּדֶרֶךְ הַמִּתְנַדְּבִים:

If he said, "I accept upon myself a grain offering from barley", he may bring it from wheat. "From flour", he may bring it from fine flour. "Without oil or frankincense", he may bring it with oil and frankincense. "Only half an <i>issaron</i>", he may bring a full <i>issaron</i>. "One and a half <i>esronim</i>", he must bring two. Rabbi Shimon exempts him since he did vow [the offering] in the way people [usually] vow.

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