From Sahih Muslim (Hadith 6470):
Abdullah reported:It was asked from Allah's Apostle (ﷺ) who amongst the people were the best. He said: (People) of my generation, then those next to them, then those next to them, then there would come a people whose evidence would precede their oath and their oath would precede their evidence. Ibrahim said: They forbade us to make vows and bear witness when we were too young
Reference: Muslim 6470