The Prophet Muhammad (S)

مَن لَطَمَ خَدَّ امرِئٍ مُسلِمٍ أو وَجهَهُ بَدَّدَ اللّهُ عِظامَهُ يَومَ القِيامَةِ، و حُشِرَ مَغلولًا حتّى يَدخُلَ جَهَنَّمَ، إلّا أن يَتوبَ.

One who slaps a Muslim in his cheek or face Allah will crush his bones on the Day of Resurrection, and he will be resurrected in chains unti...

The Prophet Muhammad (S)

لِيَنصَحِ الرّجُلُ مِنكُم أخاهُ كنَصيحَتِهِ لنَفسِهِ .

Let everyone of you give advice to his brother [and be a well-wisher to him] in exactly the same way he would give advice to himself.

The Prophet Muhammad (S)

َ كَفَى بِالْمَرْءِ عَيْباً أَنْ يَكُونَ فِيهِ ثَلَاثُ خِصَالٍ يَعْرِفُ مِنَ النَّاسِ مَا يَجْهَلُ مِنْ نَفْسِهِ وَ يَسْتَحْيِي لَهُمْ مِمَّا هُوَ فِيهِ وَ يُؤْذِي جَلِيسَهُ بِمَا لَا يَعْنِيه‏