Reference: Fataawa wa Rasaa.il Shaykh ‘Abdur-Razzaaq ‘Afeefee – Page 411, Fatwa No.23
Question: Regarding moving the index finger [of the right hand] in the tashahhud position; Should it be moving or is it sufficient to just point without moving?
Response: Both of them are from the Sunnah of the Prophet ﷺ, whilst it is better to move [it].
