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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
ahmad:27019 – Wakīʿ > Ḥasan > Ibn ʿAqīl > al-Rubayyiʿ b. Muʿawwidh

The Prophet ﷺ performed ablution. He inserted his two fingers in the ear-holes. (Using translation from Abū Dāʾūd 131)  

أحمد:٢٧٠١٩ – حَدَّثَنَا وَكِيعٌ عَنْ حَسَنٍ عَنْ ابْنِ عَقِيلٍ عَنِ الرُّبَيِّعِ بِنْتِ مُعَوِّذٍ

أَنَّ النَّبِيَّ ﷺ تَوَضَّأَ فَأَدْخَلَ أُصْبُعَيْهِ فِي جُحْرِ أُذُنَيْهِ  

See similar narrations below:

Collected by Abū Dāwūd, Ibn Mājah
abudawud:131 – Ibrāhīm b. Saʿīd > Wakīʿ > al-Ḥasan b. Ṣāliḥ > ʿAbdullāh b. Muḥammad b. ʿAqīl > al-Rubayyiʿ b. Muʿawwidh Ibn ʿAfrāʾ

The Prophet ﷺ performed ablution. He inserted his two fingers in the ear-holes.  

أبو داود:١٣١ – حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعِيدٍ حَدَّثَنَا وَكِيعٌ حَدَّثَنَا الْحَسَنُ بْنُ صَالِحٍ عَنْ عَبْدِ اللَّهِ بْنِ مُحَمَّدِ بْنِ عَقِيلٍ عَنِ الرُّبَيِّعِ بِنْتِ مُعَوِّذِ ابْنِ عَفْرَاءَ

أَنَّ النَّبِيَّ ﷺ تَوَضَّأَ فَأَدْخَلَ إِصْبَعَيْهِ فِي جُحْرَىْ أُذُنَيْهِ  

ibnmajah:441 – Abū Bakr b. Abū Shaybah And ʿAlī b. Muḥammad > Wakīʿ > al-Ḥasan b. Ṣāliḥ > ʿAbdullāh b. Muḥammad b. ʿAqīl > al-Rubayyiʿ b. Muʿawwidh Ibn ʿAfrāʾ

"The Prophet performed ablution, and he put his fingers in the (holes) inside of his ears."  

ابن ماجة:٤٤١ – حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَعَلِيُّ بْنُ مُحَمَّدٍ قَالاَ حَدَّثَنَا وَكِيعٌ عَنِ الْحَسَنِ بْنِ صَالِحٍ عَنْ عَبْدِ اللَّهِ بْنِ مُحَمَّدِ بْنِ عَقِيلٍ عَنِ الرُّبَيِّعِ بِنْتِ مُعَوِّذِ ابْنِ عَفْرَاءَ قَالَتْ

تَوَضَّأَ النَّبِيُّ ﷺ فَأَدْخَلَ إِصْبَعَيْهِ فِي جُحْرَىْ أُذُنَيْهِ