The first three to be thrown into Hell on the Day of Resurrection.

Explanation from Ibn Qayyim (Rahimahu Allah ) of the hadeeth of the first three to be thrown into Hell in the Day of Resurrection :

"From Abu Hurayrah, who said:  I heard the Messenger of Allah say: Verily, the first to be juzged in the  Day of resurrection will be a man who had died as a Martyr. He will be brought forward. Allah will remind him of the favours He had bestowed upon him and the man will acknowledge them. Then He will ask him: `What did you do to express gratitude for it?’ The man will reply: I fought for Your Cause till I was martyred. Allah will say: You have lied. You fought so that people might call you courageous; and they have done so.’ Command will then be issued about him and he will be dragged on his face and thrown into Hell. Next a man who had acquired and imparted knowledge and read the Quran will be brought forward. Allah will remind him of the favours He had bestowed upon him and the man  and the man will acknowledge them. The He will ask him: What did you do to express gratitude for it? The man will reply: `I acquired knowledge and taught it, and read the Qur’an for Your sake.’  Allah will say to him: `You have lied. You acquired knowledge so that people might call you a learned (man), and you read the Qur’an so that they might call you a reciter, and they have done so. Command will then be issued about him , and he will be dragged on his face and thrown into Hell. Next a man who Allah  had made afluent and to whom Allah had given plenty of wealth , will be brought forward. Allah will remind him of the favours He had bestowed upon him and the man will acknowledge them. He will ask him What did you do to express gratitude for it?’ The man will reply: I did not neglect any of  the ways You liked wealth to be spend liberally for Your sake. Allah will say to him : You have lied. You did it so that people might call you generous, and they have done so.’ Command will then be issued about him and he will be dragged on his face and thrown into Hell.”

                                              (Saheh Muslim, 13/45/1905)

Then he says:  I heard Shaykh al Islaam Ibn Taymiyyah say : Just as the best of the people are the Prophets, then the worst of the people is the one who imitates them, giving the false impression that he is from them. The best of the people after them are the Ulemaa' and the Shuhadaa' and the Siddeeqoon and the Mukhlisoon and the worst of the people is the one who imitates them while giving the false impression that he is from them, while he is not from them.

SOURCE: Ibn Qayyim (Rahimahu Allah ) in Ad-Daa’ Wad-Dawaa’ pp38-39