What is the method of raising and moving the index finger during the tashahhud?

Question:
Does one move the index finger during the tashahhud?

Answer:
No, I have not come across this in any of the narrations. I do not recall finding any report about raising the index finger. However, there is a narration from Ibn Abbas in Abu Dawud with a good chain, which indicates that when mentioning the oneness of Allah during the tashahhud, one points with the finger. This may be a general practice.
Q: Moving the index finger during the tashahhud?
A: It was mentioned earlier in a weak hadith.
Q: Is it at all times or specific to certain moments?
A: What appears to be the case is that it is done during supplication, and during... the declaration of the oneness of Allah, and during supplication as a sign of the oneness of Allah. As for the index finger, it remains upright, slightly bent, as in the narration of al-Nasa'i. But... during the declaration of the oneness of Allah or supplication, it is moved slightly, in order to reconcile the narrations.