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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
bayhaqi:5793 – Abū Bakr b. al-Ḥārith al-Faqīh > Abū Muḥammad b. Ḥayyān al-Aṣbahānī > Ibn Jamīl > Ibn Manīʿ > Muḥammad b. Muyassar > Isrāʾīl > ʿAbd al-Aʿlá > Abū ʿAbd al-Raḥman > ʿAlī from al-Sunnah

[Machine] "To offer assistance to the Imam when he asks for it, I asked Abu Abdul Rahman, 'How can I assist the Imam?' He replied, 'By remaining silent.'"  

البيهقي:٥٧٩٣ – وَأَخْبَرَنَا أَبُو بَكْرِ بْنُ الْحَارِثِ الْفَقِيهُ أنبأ أَبُو مُحَمَّدِ بْنُ حَيَّانَ الْأَصْبَهَانِيُّ ثنا ابْنُ جَمِيلٍ ثنا ابْنُ مَنِيعٍ ثنا مُحَمَّدُ بْنُ مُيَسَّرٍ ثنا إِسْرَائِيلُ عَنْ عَبْدِ الْأَعْلَى عَنْ أَبِي عَبْدِ الرَّحْمَنِ قَالَ قَالَ عَلِيٌّ ؓ مِنَ السُّنَّةِ

أَنْ تَفْتَحَ عَلَى الْإِمَامِ إِذَا اسْتَطْعَمَكَ قُلْتُ لِأَبِي عَبْدِ الرَّحْمَنِ مَا اسْتِطْعَامُ الْإِمَامِ؟ قَالَ إِذَا سَكَتَ  

See similar narrations below:

Collected by Suyūṭī
suyuti:4-328b – By ʿAbd al-Raḥmn > Qāl ʿLy Mn al-Sunnah
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السيوطي:٤-٣٢٨b –

"عن أبي عَبدِ الرَّحمنِ قَال: قالَ عليٌّ: من السُّنَّةِ أَنْ تَفْتَحَ عَلَى الإِمامِ إِذا استطْعَمَك، قِيل لأبي عَبدِ الرَّحَمنِ: ما اسْتِطعَامُ الإِمامِ؟ قالَ: إذَا سَكَتَ".  

ابن منيع، [ك] الحاكم في المستدرك