﴿ وَسْـَٔلِ ٱلْقَرْيَةَ ٱلَّتِى كُنَّا فِيهَا وَٱلْعِيرَ ٱلَّتِىٓ أَقْبَلْنَا فِيهَا ۖ وَإِنَّا لَصَٰدِقُونَ ﴾

“And ask thou in the town in which we were [at the time], and of the people of the caravan with whom we travelled hither, and [thou wilt find that] we, are indeed telling the truth!"'”

and the caravan with which we approached, from among the animal faculties. So ask them that they might inform you of your son's thievery.