Anas b. Malik reported Allah’s Apostle (ﷺ) as saying:
Some persons from amongst my associates would turn to my Cistern; when I would see them and they would be presented to me, they would be detained in the way while coming to me. I would say: My Lord, they are my companions, they are my companions, and it would be said to me: YOU DON’T KNOW WHAT INNOVATIONS THEY MADE AFTER YOU.
Sahih Muslim 2304 a
Book 30, Hadith 5706