The Prophet (peace and blessings of Allaah be upon him) said

[al-Tirmidhi 2676]
The Prophet (peace and blessings of Allaah be upon him) said: “Whoever among you lives (for a long time) will see many differences. I urge you to follow my Sunnah and the way of the rightly-guided khaleefahs who come after me. Hold on to it firmly. Beware of newly-invented matters, for every innovation is a going astray.”