COMMENTARY on 12:73
A. Yusuf Ali:

Translation:
(The brothers) said: "By Allah. well you know that we came not to make mischief in the land, and we are no thieves!" 1738
Commentary:

1738  As strangers in a strange land, they were liable to be suspected as spies or men who meditated some unlawful design, or some crime, such as theft, which would be common in a season of scarcity. The brothers protested against the absurdity of such a suspicion after they had been entertained so royally by the Wazir.