Surah Yusuf — Ayah 82 (12:82)
وَسۡـَٔلِ ٱلۡقَرۡيَةَ ٱلَّتِي كُنَّا فِيهَا وَٱلۡعِيرَ ٱلَّتِيٓ أَقۡبَلۡنَا فِيهَاۖ وَإِنَّا لَصَٰدِقُونَ ٨٢
English translation (Saheeh International)
And ask the city in which we were and the caravan in which we came - and indeed, we are truthful.'"
Brief commentary
In order to confirm that they were telling the truth, the brothers told their father to ask the people of the town where they had been, and to ask the people of the caravan they had come with, and that these people would tell him the same thing as they had. They said they were telling the truth in what they told him about his son’s theft.