Mishnayos Eruchin Perek 5 Mishnah 2

If one vows: It is incumbent upon me to donate the assessment of my forearm, the court appraises him to determine how much he is worth with a forearm and how much he is worth without a forearm, and he pays the difference. This is a halakha that is more stringent with regard to vows of assessment than with regard to valuations, as one who says: It is incumbent upon me to donate the valuation of my forearm, is exempt from paying. There are halakhot that are more stringent with regard to valuations than with regard to vows of assessment. How so? In the case of one who says: It is incumbent upon me to donate my valuation, and then dies, his heirs must give his valuation to the Temple treasury. But one who says: It is incumbent upon me to donate my assessment, and then dies, his heirs need not give his assessment to the Temple treasury, as there is no monetary value for the dead. One who says: It is incumbent upon me to donate the valuation of my forearm, or: The valuation of my leg, has not said anything, as there are valuations in the Torah only for a complete person. But if one says: It is incumbent upon me to donate the valuation of my head, or: The valuation of my liver, he gives the valuation of his entire self. This is the principle: One who valuates an item upon which the soul is dependent, i.e., without which one will die, gives the valuation of his entire self.

דְּמֵי יָדִי עָלָי, שָׁמִין אוֹתוֹ, כַּמָּה הוּא שָׁוֶה בְּיָד, וְכַמָּה הוּא שָׁוֶה בְּלֹא יָד. זֶה חֹמֶר בַּנְּדָרִים מִבָּעֲרָכִין. וְחֹמֶר בָּעֲרָכִין מִבַּנְּדָרִים, כֵּיצַד. הָאוֹמֵר, עֶרְכִּי עָלָי, וָמֵת, יִתְּנוּ הַיּוֹרְשִׁין. דָּמַי עָלָי, וָמֵת, לֹא יִתְּנוּ הַיּוֹרְשִׁים, שֶׁאֵין דָּמִים לַמֵּתִים. עֵרֶךְ יָדִי וְעֵרֶךְ רַגְלִי עָלָי, לֹא אָמַר כְּלוּם. עֵרֶךְ רֹאשִׁי וְעֵרֶךְ כְּבֵדִי עָלָי, נוֹתֵן עֵרֶךְ כֻּלּוֹ. זֶה הַכְּלָל, דָּבָר שֶׁהַנְּשָׁמָה תְלוּיָה בוֹ, נוֹתֵן עֵרֶךְ כֻּלּוֹ: