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.
bayhaqi:303Abū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. Hishām > Marwān b. Muʿāwiyah > Ḥumayd

[Machine] Anas performed ablution and we were with him. Then he started wiping the inside and outside of his ears, and he noticed the intensity of our gaze towards him. So he said, "Ibn Mas'ud used to instruct us to do this."  

البيهقي:٣٠٣أَخْبَرَنَا أَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ هِشَامٍ ثنا مَرْوَانُ بْنُ مُعَاوِيَةَ ثنا حُمَيْدٌ قَالَ

تَوَضَّأَ أَنَسٌ وَنَحْنُ عِنْدَهُ فَجَعَلَ يَمْسَحُ بَاطِنَ أُذُنَيْهِ وَظَاهِرَهُمَا فَرَأَى شِدَّةَ نَظَرِنَا إِلَيْهِ فَقَالَ إِنَّ ابْنَ مَسْعُودٍ كَانَ يَأْمُرُنَا بِهَذَا