Hadith Qudsi (Sacred Hadith) : Warning against hypocricy
From Authentic sources Hadith Qudsi (Sacred Hadith)
Narrated Mahmud bin Labid 
: Allah`s Messenger 
said: The most dreadful thing which I fear about you is minor polytheism. The companions asked: What is the minor polytheism? He said: It is hypocrisy; and he added that on the Day of Judgement, when rewarding people for their deeds, Allah Subuhanahu wa ta`ala will say to the hypocrites: Go to those for the sake of whom you used to preform good deeds; and see whether you can get any reward from them.
(This Hadith is sound and mentioned in Musnad Ahmad).
