Thus did We raise them up that they might question each other. A speaker from amongst them said, "How long have you tarried?" They said, "We have tarried perhaps a day or part of a day." Others said, "Allah knows best how long you have been here. Now send one of you with this money of your s to the city, and let him look for the best food, and let him bring it to you that you may satisfy your hunger. And let him behave with subtlety (unobtrusively or with care and courtesy) and let no one perceive you (or let no one know about you).