Imam Hassan Askari (AS) narrated: A person told the Prophet of Islam (PBUH):

A man looks inside his neighbour’s house and whenever sees a Haram situation, does not leave it. The Prophet (PBUH) became angry and said: Bring him to me. Another person who was at the meeting said: O’ the Prophet of Allah (SWT), he is one of your followers and he is one of those who believes in your Welayah and Welayah of Mowla Ali (AS) and dislikes your enemies.

The Prophet of Islam (PBUH) said: Do not say he is one of our followers, this is a lie. Indeed, our followers are those who follow us in behaviour and action [1]. In another narration, Imam Sadeq (AS) said: The one who says things with his/her tongue but is against us (Ahlul Bait (AS)) with his/her deeds, is not among our Shias [2]. Imam Sadeq (AS) also said: O’ Shias of Aal-e-Mohammad, the one who cannot control himself/herself at the time of anger is not from us (Ahlul Bait (AS)) [3].

[1] Meshkatul Anwaar, Page 67.

[2] Beharul Anwaar, Vol. 68, Page 164.

[3] Tohaful Oqool, Page 380.

Source: en.shafaqna.com