וְסֻגְּרוּ דְּלָתַיִם בַּשּׁוּק, אֵלּוּ נְקָבָיו שֶׁל אָדָם. בִּשְׁפַל קוֹל הַטַּחֲנָה, עַל יְדֵי דְּלֵית מְסוֹסָא טָחֵין. וְיָקוּם לְקוֹל הַצִּפּוֹר, הָדֵין סַבְיָא כַּד שָׁמַע צִיפָּרִין מְצַיְצִיָּין אֲמַר לִסְטִין אֲתוֹ לְקַפָּחָא יָתֵיהּ. וְיִשַּׁחוּ כָּל בְּנוֹת הַשִּׁיר, אֵלּוּ הַשְֹּׂפָתוֹת. רַבִּי חִיָּא בְּרַבִּי נְחֶמְיָה אָמַר אֵלּוּ הַכְּלָיוֹת שֶׁהֵן חוֹשְׁבוֹת, וְהַלֵּב גּוֹמֵר.
“The doors to the street will be shut, with the fading of the sound of the mill; and one will arise to the voice of a bird, and all the sources of music will be lowered” (Ecclesiastes 12:4). “The doors to the street will be shut” – these are a person’s orifices; “with the fading of the sound of the mill” – because the stomach is not grinding; “and one will arise to the voice of a bird” – the elderly, when they hear the birds tweeting, they say: Robbers are coming to rob me; “and all the sources of music will be lowered” – these are the lips. Rabbi Ḥiyya ben Rabbi Neḥemya says: These are the kidneys that conceive, and the heart concludes.