A (true) Muslim is the one from whose tongue and hand, Muslims at rest stand.
المُسْلِمُ مَنْ سَلِمَ المُسْلِمُوْنُ مِنْ لِسَانِهِ وَيَدِهِ.
A believer does not resort to jealousy or flattery, save in seeking knowledge.
لَيْسَ مِنْ أخْلاقِ المُؤْمِنِ التَّمَلُّقُ وَلا الحَسَدُ، إلاّ في طَلَبِ العِلْمِ.
A believer has all kinds of natures save treachery and telling lie.
يُطْبَعُ المُؤْمِنُ عَلى كُلِّ خُلْقٍ؛ لَيْسَ الخِيَانَةُ وَالكِذْبُ.
A believer is like unto a perfumer who will benefit you, should you keep company with him, or move along with him, or be a partner to him.
مَثَلُ المُؤْمِنِ كَمَثَلِ العَطَّارِ إنْ جالَسْتَهُ نَفَعَكَ، وَإنْ مَشَيْتَهُ نَفَعَكَ، وَإنْ شَارَكْتَهُ نَفَعَكَ.
A believer is more worried about the affairs of this and the next worlds than others.
أَعْظَمُ النَّاسِ هَمَّاً الْمُؤْمِنُ؛ يَهْتَمُّ بِأَمْرِ دُنْياهُ وَأَمْرِ آخِرَتِهِ.
A believer is shrewd, careful and cautious.
المُؤْمِنُ كَيِّسٌ فَطِنٌ حَذِرٌ.
A believer is the one whom people consider honest as to their lives, wealth and blood.
المُؤْمِنُ مَنْ أمِنَهُ النَّاسُ عَلى أنْفُسِهِمْ وَأمْوَالِهِمْ وَدِمَائِهِمْ.
A believer is the source of benefit. He will avail you, should you keep his company, counsel with him and become his partner. He is the cause of benefit in all affairs.
المُؤْمِنُ مَنْفَعَةٌ، إنْ مَاشَيْتَهُ نَفَعَكَ، وَإنْ شَاوَرْتَهُ نَفَعَكَ، وَإنْ شَارَكْتَهُ نَفَعَكَ، وَكُلُّ شَيْ ءٍ مِنْ أمْرِهِ مَنْفَعَةٌ.
A believer makes friends (with people), and there is no good in the one who does not make friends and is not subject of friendship.
المُؤْمِنُ يَأْلَفُ؛ وَلا خَيْرَ فِيمَنْ لا يَأْلَفُ وَلا يُؤْلَفُ.
A believer must not feel satiated, with his neighbor being hungry.
لا يَشْبَعُ المُؤْمِنُ دُونَ جَارِهِ.
A believer will not be bitten twice from the same hole.
لا يُلْدَغُ المُؤْمِنُ مِنْ جُحْرٍ مَرَّتَينِ.
A believer will not kill anybody in ambush warfare.
لا يَفْتِكُ مُؤْمِنٌ.
source : http://www.maaref-foundation.com