Al-Kahf 18:19 وكذالك بعثناهم ليتساءلوا بينهم قال قايل منهم كم لبثتم قالوا لبثنا يوما او بعض يوم قالوا ربكم اعلم بما لبثتم فابعثوا احدكم بورقكم هاذه الى المدينة فلينظر ايها ازكى طعاما فلياتكم برزق منه وليتلطف ولا يشعرن بكم احدا ١٩

Likewise, We awakened them (from their long deep sleep) that they might question one another. A speaker from among them said: "How long have you stayed (here)?" They said: "We have stayed (perhaps) a day or part of a day." They said: "Your Lord (Alone) knows best how long you have stayed (here). So send one of you with this silver coin of yours to the town, and let him find out which is the good lawful food, and bring some of that to you. And let him be careful and let no man know of you.