Hebrew

ŝāhēd - witness (HALOT 1311)

Hbr. ŝāhēd in Job 16:19 is an obvious Aramaism (Wagner 1966:109).

PArm
*ŝhd - to witness (Kogan 2015:396)
The only cognate of PArm. *ŝhd ‘to witness’ is Arb. šhd with the same meaning (Lane 1609).