יחזקאל ט:ב מקורות בתלמוד: Jerusalem Talmud Yoma

Why in white clothing? Rebbi Ḥiyya bar Abba said, like the service up high so is the service down below. As up high, a man in their midst clothed in linen⁶⁴Ez. 9:2., so down below a holy linen shirt he shall wear⁶⁵Lev. 16:4..