Do the actions that occur in the mosque during congregational prayer—such as combining the Adhan with adhkar and prayers upon the Prophet, and reciting Al-Fatiha for his soul only on Thursdays, and the Imam changing the letters of some Quranic words due to his Kurdish accent despite his ability to pronounce them correctly—incur sin, or reward, or does it make no difference whether they occur? And is it permissible to speak with them about that if they are mistaken?

The "Tathwīb" (call to prayer supplement) for the Fajr Adhan (definition) (dawn prayer call) is to say "Prayer is better than sleep" twice after "Hayya 'ala al-Falah" (Hasten to success), in accordance with the authentic Sunnah (definition). As for other forms of remembrance (dhikr) besides this, they are innovations (muhdath) and disliked (makrooh), and their dislike can reach the level of prohibition (tahreem), such as saying "Qad Qamat al-Salat" (The prayer has begun) or "Hayya 'ala al-Salat" (Hasten to prayer) between the Adhan and the Iqamah (definition) (call to commence prayer). Those who commit these errors should be advised with wisdom and good counsel.