Syriac

šṭārā, ˀešṭārā - deed, document (LSyr.:773; SL 1549)

The word has no verbal exponent. Usually considered to be an Akkadian loanword. 

PS
*šṭr - to write (Kogan–Krebernik 2021a:392f.)

The history of this root and its meaning being equal in such geographically and genealogically remote idioms as Akkadian, Arabic and ESA, but virtually absent from Aramaic, is enigmatic. Cf. Kogan–Krebernik 2021a:392f. for the discussion.