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
2110
Sahih Bukhari
Sahih
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الْمُزَابَنَةِ. وَالْمُزَابَنَةُ اشْتِرَاءُ الثَّمَرِ بِالتَّمْرِ كَيْلاً، وَبَيْعُ الْكَرْمِ بِالزَّبِيبِ كَيْلاً.
Narrated `Abdullah bin `Umar:
Allah's Messenger (ﷺ) forbade Muzabana; and Muzabana means the selling of fresh dates (on the trees) for dried dates by measure and also the selling of fresh grapes for dried grapes by measure.
Reference: Sahih al-Bukhari 2185 In-book : Book 34, Hadith 132 USC-MSA web (English) : Vol. 3, Book 34, Hadith 390 (deprecated)
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