תּלמוד אויף שמות 28:36

The diadem was inscribed “Holy for the Eternal”, “holy” below and “Eternal” above²⁷The diadem worn by the High Priest when officiating; Ex. 28:36. As explained in the parallels in the Babli (Šabbat 63b, Sukkah 5a) and in Yerushalmi Megillah1:11(71d 1. 57) only the four letters of the Name were in the upper line and קדוש ל on the bottom., like a king who sits on his throne²⁸Greek καθέδριον. τὸ , "small chair".. And similarly, “one” below and the Name above²⁹On the lot was inscribed not only “for the Eternal” but “one for the Eternal”.. Rebbi Eleazar ben Rebbi Yose said, I saw it in Rome³⁰He reports to have seen the High Priest’s vestment in Rome, Meˋilah 17b. and it was written on it in one line, “Holy for the Eternal”.

MISHNAH: The High Priest officiates in eight garments and the common priest⁶¹Greek ὶδιώτης, ὁ. in four, in shirt, trousers, turban, and belt⁶²Ex. 28:40,42.. The High Priest in addition wears breastplate, vest, coat, and diadem⁶³Ex. 28:4,36,42.. In these one asks Urim and Tummim, but one does not ask for common people, only for a king, or the Court, or one on whom rest the needs of the public.

But why should we not derive it from the golden headplate (ציץ), as it was taught: The tzitz was in the shape of a plate of gold two finger-breadths broad and stretching from ear toear, and upon it were engraved two lines, Yod and Heh above, and Kodesh [followed by a] Lamed below, and R. Eliezer son of R. Yose said, I saw it in Rome and it had Kodesh Ladonai on one line.