It is narrated from Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) that a man came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah! Give me some advice that is brief. The Prophet (peace and blessings be upon him) said to him: "Adopt despair of (and independence from) what is in the hands of people (of wealth), and beware of greed, for it is present poverty. Offer your prayer as though you are bidding farewell (to the world), and beware of anything for which you would later have to apologise." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.