Reference for Nazir 1:5

הֲרֵינִי נָזִיר מְלֹא הַבַּיִת אוֹ מְלֹא הַקֻּפָּה, בּוֹדְקִין אוֹתוֹ, אִם אָמַר אַחַת גְּדוֹלָה נָזָרְתִּי, נָזִיר שְׁלשִׁים יוֹם. וְאִם אָמַר סְתָם נָזָרְתִּי, רוֹאִין אֶת הַקֻּפָּה כְּאִלּוּ הִיא מְלֵאָה חַרְדָּל, וְנָזִיר כָּל יָמָיו:

(If he said:) "I shall be a Nazirite a full house," or "a full basket," he is examined (i.e., questioned). If he says: I took upon myself one Naziritism [which seemed to me as] great [as the entire house], he becomes a Nazirite for thirty days. And if he says: I simply vowed [and I intended it to mean whatever the sages saw it to signify], the basket is perceived as if it is full of mustard (seeds) and he is a Nazirite all of his days [and he shaves every twelve months.]

Jastrow