The necessity of saying the Takbir, i.e., Allahu Akbar (Allah is the Most Great) and the commencement of As-Salat (the prayer)
باب إِيجَابِ التَّكْبِيرِ وَافْتِتَاحِ الصَّلاَةِ
462
Sahih Bukhari
Sahih
حَدَّثَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ سَعِيدِ بْنِ أَبِي سَعِيدٍ، أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ، يَقُولُ بَعَثَ رَسُولُ اللَّهِ صلى الله عليه وسلم خَيْلاً قِبَلَ نَجْدٍ، فَجَاءَتْ بِرَجُلٍ مِنْ بَنِي حَنِيفَةَ يُقَالُ لَهُ ثُمَامَةُ بْنُ أُثَالٍ، فَرَبَطُوهُ بِسَارِيَةٍ مِنْ سَوَارِي الْمَسْجِدِ.
Narrated Abu Huraira:
Allah's Messenger (ﷺ) sent some horse men to Najd and they brought a man called Thumama bin Uthal from Bani Hanifa. They fastened him to one of the pillars of the mosque.
Reference: Sahih al-Bukhari 469 In-book : Book 8, Hadith 117 USC-MSA web (English) : Vol. 1, Book 8, Hadith 458 (deprecated)
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