Abdullah Ibn Abi Salool one of the most serious enemies of the Prophet of Islam (PBUH) at the beginning of Islam asked permission to see him.

The Prophet (PBUH) mentioned how crooked Abdullah was and how he disliked him and then said: Allow him to enter. When Abdullah entered, the Prophet (PBUH) asked him to sit down, and talked to him kindly. After Abdullah left, Aisha said: O’ the Prophet of Allah (SWT) before his entrance, you did not talk nicely about Abdullah, but when you saw him, you treated him nicely. The Prophet (PBUH) said: O’ Aisha, the most wicked person on the Day of Judgment is the one who other people face him nicely to avoid his mischief [1].

[1] Mostadrakul Wasa’el, Vol. 2, Page 92.

Source: en.shafaqna.com