Hebrew · Midrash Rabbah (Hebrew, Torat Emet)חֲמִשָּׁה שֵׁמוֹת נִקְרְאוּ לָהּ: נֶפֶשׁ, רוּחַ, נְשָׁמָה, יְחִידָה, חַיָּה. נֶפֶשׁ, זֶה הַדָּם, שֶׁנֶּאֱמַר (דברים יב, כג): כִּי הַדָּם הוּא הַנֶּפֶשׁ. רוּחַ, שֶׁהִיא עוֹלָה וְיוֹרֶדֶת, שֶׁנֶּאֱמַר (קהלת ג, כא): מִי יוֹדֵעַ רוּחַ בְּנֵי אָדָם הָעוֹלָה הִיא לְמַעְלָה. נְשָׁמָה, זוֹ הָאוֹפִיָּא, דִּבְרִיָּתָא אָמְרִין הָאוֹפִיתָא טָבָא. חַיָּה, שֶׁכָּל הָאֵבָרִים מֵתִים וְהִיא חַיָּה בַּגּוּף. יְחִידָה, שֶׁכָּל הָאֵבָרִים מִשְׁנַיִם שְׁנַיִם, וְהִיא יְחִידָה בַּגּוּף. הֲדָא הוּא דִכְתִיב (איוב לד, יד): אִם יָשִׂים אֵלָיו לִבּוֹ רוּחוֹ וְנִשְׁמָתוֹ אֵלָיו יֶאֱסֹף, רַבִּי יְהוֹשֻׁעַ בַּר נְחֶמְיָה וְרַבָּנָן, רַבִּי יְהוֹשֻׁעַ בַּר נְחֶמְיָה אָמַר אִם יָשִׂים אֱלֹהִים לִבּוֹ עַל הָאָדָם הַזֶּה, רוּחוֹ כְּבָר הָיָה בְּיָדוֹ (שנאמר): וְנִשְׁמָתוֹ אֵלָיו יֶאֱסֹף בְּגוּפוֹ כְּבָר יִגְוַע כָּל אָדָם, אֶלָּא בְּשָׁעָה שֶׁאָדָם יָשֵׁן, נְשָׁמָה מְחַמֶּמֶת אֶת הַגּוּף שֶׁלֹא יִצְטַנֵּן וְיָמוּת. רַבָּנָן אוֹמְרִים אִם יָשִׂים אֱלֹהִים לִבּוֹ לָאָדָם הַזֶּה רוּחוֹ כְּבָר הוּא בְּיָדוֹ וְנִשְׁמָתוֹ אֵלָיו יֶאֱסֹף לְמַעְלָה כְּבָר יִגְוַע כָּל אָדָם יַחַד, אֶלָּא בְּשָׁעָה שֶׁאָדָם יָשֵׁן נְשָׁמָה מְחַמֶּמֶת הַגּוּף שֶׁלֹא יִצְטַנֵּן וְיָמוּת, הֲדָא הוּא דִכְתִיב (משלי כ, כז): נֵר ה' נִשְׁמַת אָדָם. רַבִּי בִּיסְנִי וְרַבִּי אַחָא וְרַבִּי יוֹחָנָן בְּשֵׁם רַבִּי מֵאִיר אוֹמְרִים, הַנְּשָׁמָה הַזּוֹ מְמַלְּאָה אֶת כָּל הַגּוּף, וּבְשָׁעָה שֶׁאָדָם יָשֵׁן הִיא עוֹלָה וְשׁוֹאֶבֶת לוֹ חַיִּים מִלְּמַעְלָה. רַבִּי לֵוִי בְּשֵׁם רַבִּי חֲנִינָא אָמַר, עַל כָּל נְשִׁימָה וּנְשִׁימָה שֶׁאָדָם נוֹשֵׁם צָרִיךְ לְקַלֵּס לַבּוֹרֵא, מַה טַּעַם (תהלים קנ, ו): כֹּל הַנְּשָׁמָה תְּהַלֵּל יָהּ, כָּל הַנְּשִׁימָה תְּהַלֵּל יָהּ.
English · The Sefaria Midrash Rabbah (2022)It [man’s soul] is called by five names: nefesh (Genesis 2:7), ruaḥ (Ezekiel 37:14), neshama (Genesis 2:7), yeḥida (Psalms 22:21), ḥaya (Psalms 143:3). Nefesh – this refers to blood, as it is stated: “For blood is the soul [nefesh]” (Deuteronomy 12:23). Ruaḥ – because it ascends and descends, as it is stated: “Who knows the spirit of the sons of man? Does it ascend upward?” (Ecclesiastes 3:21). Neshama – this refers to man’s intellect, as people say: Intellect is good. Ḥaya – because all of one’s limbs may die, but it [the soul] remains alive [ḥaya] in the body. Yeḥida – because all of one’s limbs are in pairs, but it [the soul] is solitary [yeḥida] in the body.
This is what is written: “If He directs His attention to him, his spirit [ruḥo] and his soul [nishmato] He will gather to him” (Job 34:14). Rabbi Yehoshua bar Neḥemya and the Rabbis, Rabbi Yehoshua bar Neḥemya said: If God would direct his attention to this person, his spirit would already be in His hand. “And his soul He will gather to him” – [if He would gather the soul into one single place] in his body, the entire man would die. Rather, when a person sleeps, the soul warms the [entire] body so that it does not get too cold and die. The Rabbis say: If God would direct his attention to this person, and his spirit [ruaḥ] would already be in His hand, “and his soul He will gather to Him” on High, the entire man would die. When a person is sleeping, however, the soul [neshama] [is left within him, and it] warms the body so it will not get too cold and die. That is what is written: “The spirit [neshama] of man is the lamp of the Lord” (Proverbs 20:27).
Rabbi Bisni, Rabbi Aḥa, and Rabbi Yoḥanan say in the name of Rabbi Meir: The neshama fills the entire body, and when a person sleeps, it ascends upward and draws life for him from above. Rabbi Levi said in the name of Rabbi Ḥanina: For each and every breath that a person takes, he must laud the Creator. What is the source? “Let every soul [neshama] praise God” (Psalms 150:6) – [read instead:] Let every breath [neshima] praise God.