Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:2964Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. Isḥāq al-Ṣaghānī > Saʿīd b. ʿĀmir > Shuʿbah > Abū Isḥāq > Abū al-Aḥwaṣ

[Machine] Abdullah said, "The takbir is the opening of the prayer, and its closure is the taslim when the imam says it. So stand up if you wish. And this authentic narration is evidence of the correctness of what we say."  

البيهقي:٢٩٦٤أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو قَالَا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ إِسْحَاقَ الصَّغَانِيُّ ثنا سَعِيدُ بْنُ عَامِرٍ عَنْ شُعْبَةَ عَنْ أَبِي إِسْحَاقَ عَنْ أَبِي الْأَحْوَصِ قَالَ

قَالَ عَبْدُ اللهِ مِفْتَاحُ الصَّلَاةِ التَّكْبِيرُ وَانْقِضَاؤُهَا التَّسْلِيمُ إِذَا سَلَّمَ الْإِمَامُ فَقُمْ إِنْ شِئْتَ وَهَذَا الْأَثَرُ الصَّحِيحُ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ يَدُلُّ عَلَى صِحَّةِ مَا نَقُولُ