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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:22033 – ʿAbd al-Ṣamad > ʿAbd al-ʿAzīz b. Muslim > al-Ḥuṣayn > ʿAbd al-Raḥman b. Abū Laylá > Muʿādh

[Machine] People during the time of the Messenger of Allah ﷺ used to ask someone who has preceded them in their prayer to lead them in prayer. They would gesture to him with what he has preceded in prayer and he would start by completing what he has preceded. Then, he would join the people in their prayer.

One day, Mu'adh bin Jabal came and the people were sitting while performing their prayer. Mu'adh sat down and when the Messenger of Allah ﷺ finished, he stood up and completed what he has preceded. Then, the Messenger of Allah ﷺ said, "Do as Mu'adh did."  

أحمد:٢٢٠٣٣ – حَدَّثَنَا عَبْدُ الصَّمَدِ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُسْلِمٍ حَدَّثَنَا الْحُصَيْنُ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى عَنْ مُعَاذٍ قَالَ

كَانَ النَّاسُ عَلَى عَهْدِ رَسُولِ اللهِ ﷺ إِذَا سُبِقَ الرَّجُلُ بِبَعْضِ صَلَاتِهِ سَأَلَهُمْ فَأَوْمَئُوا إِلَيْهِ بِالَّذِي سُبِقَ بِهِ مِنَ الصَّلَاةِ فَيَبْدَأُ فَيَقْضِي مَا سُبِقَ ثُمَّ يَدْخُلُ مَعَ الْقَوْمِ فِي صَلَاتِهِمْفَجَاءَ مُعَاذُ بْنُ جَبَلٍ وَالْقَوْمُ قُعُودٌ فِي صَلَاتِهِمْ فَقَعَدَ فَلَمَّا فَرَغَ رَسُولُ اللهِ ﷺ قَامَ فَقَضَى مَا كَانَ سُبِقَ بِهِ فَقَالَ رَسُولُ اللهِ ﷺ اصْنَعُوا كَمَا صَنَعَ مُعَاذٌ  

See similar narrations below:

Collected by Ṭabarānī
tabarani:17470 – ʿUmar b. ʿAbd al-ʿAzīz b. Miqlāṣ from my father > Ibn Wahb > Abū Yaḥyá b. Sulaymān > Zayd b. Abū Unaysah > ʿAmr b. Murrah > ʿAbd al-Raḥman b. Abū Laylá > Muʿādh b. Jabal

[Machine] People during the time of the Messenger of Allah ﷺ used to ask someone who arrived late for prayer to lead them in prayer, indicating the number of units they missed. Then, they would join the latecomer in their prayer. Once, Mu'adh and the people were sitting, and they were in the midst of their prayer. Mu'adh joined them and when the Messenger of Allah ﷺ completed the prayer, he stood up and offered the missed units. Then, the Messenger of Allah ﷺ said, "Do as Mu'adh bin Jabal did."  

الطبراني:١٧٤٧٠ – حَدَّثَنَا عُمَرُ بْنُ عَبْدِ الْعَزِيزِ بْنِ مِقْلَاصٍ حَدَّثَنِي أَبِي ثنا ابْنُ وَهْبٍ أَخْبَرَنِي أَبُو يَحْيَى بْنُ سُلَيْمَانَ عَنْ زَيْدِ بْنِ أَبِي أُنَيْسَةَ عَنْ عَمْرِو بْنِ مُرَّةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى عَنْ مُعَاذِ بْنِ جَبَلٍ قَالَ

كَانَ النَّاسُ عَلَى عَهْدِ رَسُولِ اللهِ ﷺ إِذَا سُبِقَ أَحَدُهُمْ بِشَيْءٍ مِنَ الصَّلَاةِ سَأَلَهُمْ فَأَشَارُوا إِلَيْهِ بِالَّذِي سُبِقَ بِهِ فَيُصَلِّي مَا سُبِقَ بِهِ ثُمَّ يَدْخُلُ مَعَهُمْ فِي صَلَاتِهِمْ فَجَاءَ مُعَاذٌ وَالْقَوْمُ قُعُودٌ فِي صَلَاتِهِمْ فَقَعَدَ مَعَهُمْ فَلَمَّا سَلَّمَ رَسُولُ اللهِ ﷺ قَامَ فَقَضَى مَا سُبِقَ بِهِ فَقَالَ رَسُولُ اللهِ ﷺ «اصْنَعُوا مَا صَنَعَ مُعَاذُ بْنُ جَبَلٍ»