Question 173: Even though Pakistan, our country, is a Muslim state, some Imaams insist on saying: “Peace and blessings of Allaah be upon you, O Messenger of Allaah, and beloved to Allaah” before they say the Athaan (call to Prayer). They never stop doing so. I pray behind those Imaams. Is my Salaah (Prayer) behind them valid or not? What should I do? What is the ruling on these Imaams?
Answer: Firstly, invoking Allaah’s peace and blessings upon the Messenger before and after the Athaan and saying it aloud after or during the Athaan is one of the innovated Bid`ahs in religion. It is authentically reported from the Prophet (peace be upon him) that he said, He who innovates things in our affairs for which there is no valid (reason) (commits sin) and these are to be rejected. Narrated by Al-Bukhaaree and Muslim. According to another narration, Anyone who does an act for which there is no sanction on our part, will have it rejected. Narrated by Muslim. Secondly, whoever commits a Bid`ah, approves of it or does not change it while being able to do so, is a sinner... read more here.