He Touches the Mezuzah

The Caeser then sent a 3rd troop of Roman soldiers after him, to bring Onkelos.

Caeser:	Do not converse with him at all.
The troops followed this instruction, and took Onkelos with them. While they grabbed him and were walking, Onkelos saw a mezuza that was placed on the doorway. He placed his hand upon it and asked the soldiers,
Onkelos:	What is this?
Soldiers:	You tell us.