Hadith 1539
Ibn Mas'ud (May Allah be pleased with him) said:
وعن ابن مسعود رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : “لا يُبلغني أحد من أصحابي عن أحد شيءا، فإني أحب أن أخرج إلىكم وأنا سليم الصدر". ((رواه أبوداود والترمذي))
The Messenger of Allah (ﷺ) said, "None of my Companions should convey to me anything regarding another because I desire to meet everyone of you with a clean heart." [Abu Dawud and At- Tirmidhi].
In plain words
He asked that no one report to him the faults of others, because he wished to meet each Companion with a clean, untroubled heart. Carrying people's words to those in authority plants grudges best left unsown.
Reference : Riyad as-Salihin 1539 In-book reference : Book 17, Hadith 29