وَعَنْ أَبِي سَعِيدٍ اَلْخُدْرِيِّ ‏- رضى الله عنه ‏- { أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-رَأَى فِي أَصْحَابِهِ تَأَخُّرًا.‏ فَقَالَ:

"تَقَدَّمُوا فَائْتَمُّوا بِي, وَلْيَأْتَمَّ بِكُمْ مَنْ بَعْدَكُمْ"

} رَوَاهُ مُسْلِم ٌ 1‏.‏

‏1 ‏- صحيح.‏ رواه مسلم (438)‏ وتمامه: "لا يزال قوم يتأخرون حتى يؤخرهم الله".‏

Translation
Narrated 'Abdullah bin Mas'ud (RA)

Allah's Messenger (ﷺ) looked at us and said, "When one of you is (sitting) in prayer, he should say, 'All services reported by words, by prayers (acts of worship), and all good things are due to Allah, peace be upon you, OProphet, and Allah's mercy and blessings, peace be upon us and upon Allah's upright slaves. I testify that nothing deserves to be worshippedexcept Allah and I testify that Muhammad is His slave and Messenger.' Then he may choose any supplication which pleases him most and recite it."[Agreed upon, and this wording is from al-Bukhari].