Assalaam Ailekum WWR
The Prophet (saw) said: He (or she) in whose presence a Muslim is being humiliated and he does not help him, even though he is able to. Allah will humiliate him before the whole of creation on the Day of Judgement. (Ahmad)

Please send me the full reference of this hadith. I think all my group need to know about this hadith and the lesson behind it.
Jazaak Allah
Mohammed