The Meaning of Bid'ah and the Hadith: "Whoever introduces into our affair something that is not part of it"

Question:
Honorable Shaykh! We begin with a letter from one of the brothers. He says: Shaykh Salih, is bid'ah (religious innovation) specific to acts of worship? What is meant by it? And what is the meaning of "Whoever introduces into our affair something that is not part of it, it is rejected"?

Answer:
In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, Lord of the worlds, and may Allah send prayers and blessings upon our Prophet Muhammad, and upon his family and all his Companions. As for what follows, bid'ah in the linguistic sense is that which is without a prior example. This is indicated by the saying of Allah the Exalted: . That is, He brought them into existence without a prior example.
As for bid'ah in the Shari'ah, it is that which is introduced into the religion without any evidence from the Book or the Sunnah. This is because acts of worship are based on divine legislation. Nothing is done in them except with evidence from the Book of Allah or the Sunnah of His Messenger (peace and blessings be upon him). Whatever goes beyond that is a rejected bid'ah. This is the meaning of the saying of the Messenger (peace and blessings be upon him): That is, it is not accepted; it is rejected and not accepted, no matter how much effort one puts into it. Bid'ahs are rejected and invalid. There is sin upon the one who commits them, and there is no reward in them whatsoever. Yes.

The presenter:
May Allah reward you with good.