Use kind words when you address your Muslim brother

And tell My servants to say that which is best. Indeed, Satan induces [dissension] among them. Indeed Satan is ever, to mankind, a clear enemy.

Qur'ān 17:53


Ibn Kathīr writes:

يأمر تعالى رسوله صلى الله عليه وسلم أن يأمر عباد الله المؤمنين أن يقولوا في مخاطباتهم ومحاوراتهم الكلام الأحسن والكلمة الطيبة فإنه إذ لم يفعلوا ذلك نزغ الشيطان بينهم وأخرج الكلام إلى الفعال ووقع الشر والمخاصمة والمقاتلة

Allāh ordered His Messenger sallallaahu alayhi wa sallam to order the believing slaves of Allāh to use nice and good words when they address one another because if they do not do so, the devil will induce dissension between them and words will lead to actions. Evil, disputes, and fighting will occur among them.

فإن الشيطان عدو لآدم وذريته من حين امتنع من السجود لآدم فعداوته ظاهرة بينة ولهذا نهى أن يشير الرجل إلى أخيه المسلم بحديدة فإن الشيطان ينزغ في يده أي فربما أصابه بها

Without a doubt, the devil is an enemy to Adam and his children since the time he refused to prostrate to Adam and his hostility is clearly apparent. This is why a person has been forbidden to point a weapon at his Muslim brother because the devil can induce him to use the weapon against his brother.


Narrated Abu Huraira:

The Prophet (sallallaahu alayhi wa sallam) said, "None of you should point out towards his Muslim brother with a weapon, for he does not know, Satan may tempt him to hit him and thus he would fall into a pit of fire (Hell)"

Sahīh al-Bukhāri Hadīth No. 7072


Reference(s):
Tafsīr Ibn Kathīr