It is narrated from the Prophet of Islam (PBUH) who said:

Jibrail (AS) never came to me except to advise me, and his last speech to me was that: Avoid animosity toward other people, because that will reveal the hidden faults and destroys dignity [1]. In another Hadith (narration), the Prophet (PBUH) said: Jibrail (AS) advised me about avoiding animosity towards other people more than any other subject [2]. In another Hadith, the Prophet (PBUH) said: Allah (SWT) will not look at three persons on the Day of Judgement, and they will be not be purified and will be inflicted with painful punishment. They are: 1) The one who walks on the earth with arrogance 2) And the one who lies about his goods 3) And the one who expresses his friendship to your face, but his heart is full of deceit and animosity towards you [3].

[1] Al-Kafi, Vol. 2, Page 302.

Source: en.shafaqna.com