Who is your friend?
Since the influence of friend of man is very deep, Islamic teachings have given an important status to the friendship. In Holy Qur’an it is stated that most of the companions of the Fire will say, in the Hell, that
“Oh, woe to me! I wish I had not taken that one as a friend. He led me away from the remembrance after it had come to me. And ever is Satan, to man, a deserter.” 
So it is very important to know how your friend is.
In this regard, there is a very nice hadith in which Imam Baqir (A.S) said:
My father Ali Ibn al- Hussein (A.S), once, advised me: ‘O son, do not associate, talk, or accompany five classes of people.’ ‘Who are they, father?’ asked me, and he (A.S) answered: ‘Beware of associating with the liar, for he is as same as a mirage: he shows you the near as remote, and shows you the remote as near. Beware of associating with the sinful, for he will disappoint you for a single bite or even something less valuable. Beware of associating with the stingy, for he will let you down when you are in urgent need of his property. Beware of associating the foolish, for he harms you when he intends to do you favor. Beware of associating with the disregardful of his relatives, for I found him cursed in the Book of Allah. 
1. Al-Furqan 28&29. يَا وَيْلَتَىٰ لَيْتَنِي لَمْ أَتَّخِذْ فُلَانًا خَلِيلًا ﴿٢٨﴾ لَّقَدْ أَضَلَّنِي عَنِ الذِّكْرِ بَعْدَ إِذْ جَاءَنِي ۗ وَكَانَ الشَّيْطَانُ لِلْإِنسَانِ خَذُولًا
2. Al-Kāfi; Vol 3, page 641
عن أبي عبد الله، عن أبيه (عليهما السلام) قال: “قال لي أبي علي بن الحسين (صلوات الله عليهما): يا بني انظر خمسة فلا تصاحبهم ولا تحادثهم ولا ترافقهم في طريق، فقلت: يا أبت من هم عرفنيهم؟ قال: إياك ومصاحبة الكذاب فإنه بمنزلة السراب يقرب لك البعيد ويبعد لك القريب وإياك ومصاحبة الفاسق فإنه بايعك باكلة أو أقل من ذلك وإياك ومصاحبة البخيل فإنه يخذلك في ماله أحوج ما تكون إليه وإياك ومصاحبة الأحمق فإنه يريد أن ينفعك فيضرك وإياك ومصاحبة القاطع لرحمه فإني وجدته ملعونا في كتاب الله
Rights of Friends
Relationship and Friendship
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