Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "People will remain in goodness as long as knowledge comes to them from the Companions of the Messenger of Allah (peace and blessings be upon him) and from their elders; and when it comes to them from their young ones, they are ruined."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8560