Where does “святотатство” come from?

святотатство (Russian) comes from Russian тать, from Old East Slavic тать, from Proto-Slavic tatь, from Proto-Indo-European teh₂tis, from Proto-Indo-European (s)teh₂- — to do something secretly, conceal, thieve.

святотатство (Russian): sacrilege desecration, profanation, misuse or violation of something sacred

Definitions

sacrilege desecration, profanation, misuse or violation of something sacred

Ancestry of “святотатство”, step by step

святотатство traces back through two separate lines of ancestry.

via Russian тать

Step	Language	Word	Meaning
1	Russian	тать	thief
2	Old East Slavic	тать	—
3	Proto-Slavic	tatь	thief
4	Proto-Indo-European	teh₂tis	—
5	Proto-Indo-European	(s)teh₂-	to do something secretly, conceal, thieve

via Russian свято́й

Step	Language	Word	Meaning
1	Russian	свято́й	holy
2	Old East Slavic	свѧтъ	holy, sacred
3	Proto-Slavic	svętъ	holy, sacred
4	Proto-Balto-Slavic	śwentas	holy, sacred
5	Proto-Indo-European	ḱwen-	holy, sacred

Every word from Proto-Indo-European (s)teh₂- →Every word from Proto-Indo-European teh₂tis →Every word from Proto-Slavic tatь →