וְעָשִׂ֤יתָ מָסָךְ֙ לְפֶ֣תַח הָאֹ֔הֶל תְּכֵ֧לֶת וְאַרְגָּמָ֛ן וְתוֹלַ֥עַת שָׁנִ֖י וְשֵׁ֣שׁ מָשְׁזָ֑ר מַעֲשֵׂ֖ה רֹקֵֽם׃
און זאָלסט מאַכן אַ פֿאָרהאַנג צום אײַנגאַנג פֿון געצעלט, פֿון בלאָער װאָל, און פּורפּל, און װערמילרױט, און געדרײַטן לײַנען, געשטיקטע אַרבעט.
Sefer HaMiddot
86. To sweeten the judgment, say the Torah portion concerning the eleven goatskin curtains (that served as roof for the Tabernacles -- Shemot 26:7-14, 36:14-19), and the Ketoress (incense, t.n. there were 11 fragrances in the Ketoress -- Shemot 30:34-38), the eleven blessings that Moshe gave to the tribes (Devarim 33:6-25), and the Chariot of Yehezkel (Yehezkel 1. t.n. It would seem from here that there is an aspect of 11 connected to the Chariot of Yehezkel. The Holy Petek that Rabbi Nachman of Breslov sent to R' Yisroel Dov Odesser has 11 lines).