Sunan an-Nasa'i, Volume 6, Book 51, Hadith 5567 (DarusSalam) ⓘ
Qatadah said: "Anas used to tell us to cut off the extra bits."
أَخْبَرَنَا سُوَيْدٌ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ سَعِيدِ بْنِ أَبِي عَرُوبَةَ، قَالَ قَتَادَةُ كَانَ أَنَسٌ يَأْمُرُ بِالتَّذْنُوبِ فَيُقْرَضُ .
also referenced under: Hadith 5564 (Reference) & Book 51, Hadith 26 (In-Book)