וַֽיַּעֲשׂ֛וּ אֶת־צִ֥יץ נֵֽזֶר־הַקֹּ֖דֶשׁ זָהָ֣ב טָה֑וֹר וַיִּכְתְּב֣וּ עָלָ֗יו מִכְתַּב֙ פִּתּוּחֵ֣י חוֹתָ֔ם קֹ֖דֶשׁ לַיהוָֽה׃
And they made the plate of the holy crown of pure gold, and wrote upon it a writing, like the engravings of a signet: HOLY TO THE LORD.
Read halakhic rulings (Jewish law) on Exodus 39:30: and classical halakhic sources.