Sayyiduna Abu Ayyub (may Allah be pleased with him) says: A man came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah! Teach me something and keep it brief. He (peace and blessings be upon him) said: "When you stand for your prayer, pray the prayer of one who is bidding farewell; do not say anything for which you would have to apologise; and make yourself free of need of what is in people's hands."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3972