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.
tabarani:12755al-ʿAbbās b. al-Faḍl al-Asfāṭī > ʿAbd al-Raḥman b. al-Mubārak al-ʿAyshī > ʿUlaylah b. Badr > Sayyār b. Salāmah > Abū al-ʿĀliyah > Ibn ʿAbbās

[Machine] He used to teach us how to perform the bowing as the Prophet ﷺ used to teach them, then he would join us in the bowing position until even if a drop of water were to fall between his shoulders, it would not move forward or backward.  

الطبراني:١٢٧٥٥حَدَّثَنَا الْعَبَّاسُ بْنُ الْفَضْلِ الْأَسْفَاطِيُّ ثنا عَبْدُ الرَّحْمَنِ بْنُ الْمُبَارَكِ الْعَيْشِيُّ ثنا عُلَيْلَةُ بْنُ بَدْرٍ ثنا سَيَّارُ بْنُ سَلَامَةَ عَنْ أَبِي الْعَالِيَةِ عَنِ ابْنِ عَبَّاسٍ قَالَ

كَانَ يُعَلِّمُنَا الرُّكُوعَ كَمَا كَانَ رَسُولُ اللهِ ﷺ يُعَلِّمُهُمْ ثُمَّ يَسْتَوِي لَنَا رَاكِعًا حَتَّى لَوْ قُطِرَتْ بَيْنَ كَتِفَيْهِ قَطْرَةٌ مِنْ مَاءٍ مَا تَقَدَّمَتْ وَلَا تَأَخَّرَتْ