Where does “scriptura” come from?

scriptura (Latin) comes from Latin scrīptum, from Latin scrībō, from Proto-Italic skreiβō, from Proto-Indo-European skreybʰ- — to write.

Ancestry of “scriptura”, step by step

Step	Language	Word	Meaning
1	Latin	scrīptum	—
2	Latin	scrībō	—
3	Proto-Italic	skreiβō	to carve
4	Proto-Indo-European	skreybʰ-	to write

scriptura — Etymology, Origin & Word History | Etymology Explorer