Some times, muslims commit the following mistakes when reciting Tasl?m:

[15/ 22] First:

When reciting Tasl?m to the right and left sides some muslims point with their right and left hands both sides.

The prophet ( - صلى الله عليه وسلم -) forbade his Sah?bah from doing so as narrated by J?bir Ibn Samurah to have said: ‘We used to point with our hands both sides when reciting Tasl?m. Seeing us doing so, the prophet ( - صلى الله عليه وسلم -) said: ‘what is the matter with you pointing with your hands [both sides] as restless horses do with their tails?! (1) Since then, they ( - رضي الله عنهم -) stopped doing this act and recited Tasl?m only’.

[16/ 22] Second:

The word “As-Sal?mu” should be pronounced with its proper length without prolonging the vowel /?/ so much.

This is an agreed upon opinion amongst scholars as Ibn Sayyid An-N?s stated.

[17/ 22] Third:

Ibn Taymiyyah was asked regarding the statements some people say when they recite Tasl?m on both sides; they say “As’alukal Fawza Bil Jannah” to the right, and “As’alukan Naj?t? Minan N?r” to the left. Is this act detested [Makr?h]?

He answered: ‘Praise be to All?h ( - عز وجل -). Indeed, this is Har?m act for it is a Bid‘ah; it was never done by the prophet ( - صلى الله عليه وسلم -) nor did any of the ‘Ulamah recommend it. The first of these two statements separates between the first and the second Tasl?m. None whatsoever has the right to separate between the parts of any prescribed act of worship in such a manner’. (2)