Hadith 5226
وَعَنْ أَبِي أَيُّوبَ الْأَنْصَارِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ: جَاءَ رَحل إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: عِظْنِي وَأَوْجِزْ. فَقَالَ: «إِذَا قُمْتَ فِي صَلَاتِكَ فَصَلِّ صَلَاةَ مُوَدِّعٍ وَلَا تَكَلَّمْ بِكَلَامٍ تَعْذِرُ مِنْهُ غَدًا وَأَجْمِعِ الْإِيَاسَ مِمَّا فِي أَيْدِي النَّاس»
Abu Ayyub Ansari (may Allah be pleased with him) narrates: A man came to the Prophet (peace and blessings of Allah be upon him) and said, "Give me a brief advice." The Prophet (peace and blessings of Allah be upon him) said: "When you pray, pray as if it is your farewell prayer. Do not say anything for which you would have to apologize tomorrow, and be completely hopeless and detached from what people possess." Weak, narrated by Ahmad.