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.
ahmad:3972Yaḥyá b. Ādam And ʾAbū Aḥmad > Isrāʾīl > Abū Isḥāq > ʿAbd al-Raḥman b. al-Aswad > Abīh Waʿalqamah > ʿAbdullāh

[Machine] The Messenger of Allah used to say the takbir (saying "Allahu Akbar") in every rukoo (bowing) and sujood (prostration), and during raising up and putting down (in prayer). Abu Bakr and Umar, may Allah be pleased with them, also used to say "Peace be upon you" and "May the mercy of Allah be upon you", using their right hands and their characteristics.  

أحمد:٣٩٧٢حَدَّثَنَا يَحْيَى بْنُ آدَمَ وَأَبُو أَحْمَدَ قَالَا حَدَّثَنَا إِسْرَائِيلُ عَنْ أَبِي إِسْحَاقَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْأَسْوَدِ عَنْ أَبِيهِ وَعَلْقَمَةَ عَنْ عَبْدِ اللهِ قَالَ

كَانَ رَسُولُ اللهِ يُكَبِّرُ فِي كُلِّ رُكُوعٍ وَسُجُودٍ وَرَفْعٍ وَوَضْعٍ وَأَبُو بَكْرٍ وَعُمَرُ رِضْوَانُ اللهِ عَلَيْهِمَا وَيُسَلِّمُونَ عَنْ أَيْمَانِهِمْ وَشَمَائِلِهِمْ السَّلَامُ عَلَيْكُمْ وَرَحْمَةُ اللهِ