It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that a man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah, tell me something that is brief." The Prophet (peace and blessings be upon him) said to him: "Pray as one who is bidding farewell prays, for if you do not see Him, He certainly sees you; and despair of what is in the hands of people, and you will be self-sufficient; and beware of anything for which you would have to apologise."
Hadith Referenceالمعجم الأوسط / باب العين / 4427
Hadith Gradingمحدثین:في إسناده من لم يعرفه الهيثمي
Hadith Takhrij«قال الهيثمي: فيه من لم أعرفهم «مجمع الزوائد ومنبع الفوائد، ج 10، ص 229»»