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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
nasai:798 – ʿUbaydullāh b. Faḍālah b. Ibrāhīm > Yaḥyá / Ibn Yaḥyá > Ḥumayd b. ʿAbd al-Raḥman b. Ḥumayd al-Ruʾāsī from his father > Abū al-Zubayr > Jābir

"The Messenger of Allah ﷺ led us in Zuhr prayer and Abu Bakr was behind him. When the Messenger of Allah ﷺ said the Takbir, Abu Bakr said the Takbir so that the people could hear."  

النسائي:٧٩٨ – أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ فَضَالَةَ بْنِ إِبْرَاهِيمَ قَالَ حَدَّثَنَا يَحْيَى يَعْنِي ابْنَ يَحْيَى قَالَ حَدَّثَنَا حُمَيْدُ بْنُ عَبْدِ الرَّحْمَنِ بْنِ حُمَيْدٍ الرُّؤَاسِيُّ عَنْ أَبِيهِ عَنْ أَبِي الزُّبَيْرِ عَنْ جَابِرٍ قَالَ

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ الظُّهْرَ وَأَبُو بَكْرٍ خَلْفَهُ فَإِذَا كَبَّرَ رَسُولُ اللَّهِ ﷺ كَبَّرَ أَبُو بَكْرٍ يُسْمِعُنَا  

See similar narrations below:

Collected by Muslim, Nasāʾī's Kubrá
muslim:413b – Yaḥyá b. Yaḥyá > Ḥumayd b. ʿAbd al-Raḥman al-Ruʾāsī from his father > Abū al-Zubayr > Jābir

The Messenger of Allah ﷺ led the prayer and Abu Bakr was behind him. When the Messenger of Allah ﷺ recited the takbir, Abu Bakr also recited (it) in order to make it audible to us. And the rest of the hadith is like one transmitted by Laith.  

مسلم:٤١٣b – حَدَّثَنَا يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا حُمَيْدُ بْنُ عَبْدِ الرَّحْمَنِ الرُّؤَاسِيُّ عَنْ أَبِيهِ عَنْ أَبِي الزُّبَيْرِ عَنْ جَابِرٍ قَالَ

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ وَأَبُو بَكْرٍ خَلْفَهُ فَإِذَا كَبَّرَ رَسُولُ اللَّهِ ﷺ كَبَّرَ أَبُو بَكْرٍ لِيُسْمِعَنَا ثُمَّ ذَكَرَ نَحْوَ حَدِيثِ اللَّيْثِ  

nasai-kubra:875 – ʿUbaydullāh b. Faḍālah b. Ibrāhīm > Yaḥyá / Ibn Yaḥyá > Ḥumayd b. ʿAbd al-Raḥman b. Ḥumayd al-Ruʾāsī from his father > Abū al-Zubayr > Jābir

"The Messenger of Allah ﷺ led us in Zuhr prayer and Abu Bakr was behind him. When the Messenger of Allah ﷺ said the Takbir, Abu Bakr said the Takbir so that the people could hear." (Using translation from Nasāʾī 798)  

الكبرى للنسائي:٨٧٥ – أَخْبَرَنِي عُبَيْدُ اللهِ بْنُ فَضَالَةَ بْنِ إِبْرَاهِيمَ قَالَ أَخْبَرَنَا يَحْيَى يَعْنِي ابْنَ يَحْيَى قَالَ أَخْبَرَنَا حُمَيْدُ بْنُ عَبْدِ الرَّحْمَنِ بْنِ حُمَيْدٍ الرُّؤَاسِيُّ عَنْ أَبِيهِ عَنْ أَبِي الزُّبَيْرِ عَنْ جَابِرٍ قَالَ

«صَلَّى بِنَا رَسُولُ اللهِ ﷺ الظُّهْرَ وَأَبُو بَكْرٍ خَلْفَهُ فَإِذَا كَبَّرَ رَسُولُ اللهِ ﷺ كَبَّرَ أَبُو بَكْرٍ يُسْمِعُنَا»