Take Your Time and Clarify

Three: To have Hikmah when dealing with others is to be patient and clarify things before snapping to conclusions.

Imam Ahmad narrates with his chain of narrators leading to Ibn Abbas who said, "A man from Bani Saleem passed by a group of the Prophet's companions. (At that time of war) The man said 'as salamu alaykum' to them. The companions concluded that he only said 'as salamu alaykum' to them as a deception to save himself from being caught. They surrounded him and Malham ibn Juthaamah killed him. From that event Allah revealed the verse...
"O you who have believed, when you go forth (to fight) in the cause of Allah, investigate, and do not say to one who gives you (a greeting of peace), "You are not a believer," Aspiring for the goods of worldly life; for with Allah are many acquisitions. You (yourselves) were like that before; then Allah conferred His favor (i.e. guidance) upon you, so investigate. Indeed, Allah is ever with what you do, acquainted." - Surah AnNisa, 4/94. From Tafseer Ibn Katheer.