'Abd Allaah ibn 'Umar said,
"The Prophet (صلى الله علیه وسلم) came to us and said, 'O Muhaajiroon, (emigrants from Makkah to al-Madinah) you may be afflicted by five things; God forbid that you should live to see them. If fornication should become widespread, you should realise that this has never happened without new diseases befalling the people which their forebears never suffered. If people should begin to cheat in weighing out goods, you should realise that this has never happened without drought and famine befalling the people, and their rulers oppressing them. If people should withhold Zakaat, you should realise that this has never happened without the rain being stopped from falling; and were it not for the animals' sake, it would never rain again. If people should break their covenant with Allaah and His Messenger, you should realise that his has never happened without Allaah sending an enemy against them to take some of their possessions by force. If the leaders do not govern according to the Book of Allaah, you should realise that this has never happened without Allaah making them into groups and making them fight one another.'" [Ibn Maajah] 
'Alee ibn Abee Taalib said,
"The Prophet (صلى الله علیه وسلم) said: 'If my Ummah bears fifteen traits, tribulation will befall it.' Someone asked, 'What are they, O Messenger of Allaah?' He said, 'When any gain is shared out only among the rich, with no benefit to the poor; when a trust becomes a means of making a profit; when paying Zakaat becomes a burden; when a man obeys his wife and disobeys his mother; and treats his friend kindly whilst shunning his father; when voices are raised in the mosques; when the leader of a people is the worst of them; when people treat a man with respect because they fear some evil he may do; when much wine is drunk; when men wear silk; when female singers and musical instruments become popular; when the last ones of this Ummah curse the first ones - then let them expect a red wind, or the earth to swallow them, or to be transformed into animals.'" [Tirmidhee] 
'Alee ibn Abee Taalib said,
"The Prophet (صلى الله علیه وسلم) led us in praying Salaat al-Fajr (the morning prayer). When he had finished, a man called to him: 'When will the Hour be? The Prophet (صلى الله علیه وسلم) reprimanded him and said 'Be quiet!' After a while he raised his eyes to the sky and said, 'Glorified be the One Who raised it and is taking care of it.' Then he lowered his gaze to the earth and said, 'Glory be to the One Who has outspread it and has created it.' Then the Prophet (صلى الله علیه وسلم) said, 'Where is the one who asked me about the Hour?' The man knelt down and said, 'I asked you.' The Prophet (صلى الله علیه وسلم) said, 'The Hour will come when leaders are oppressors, when people believe in the stars and reject al-Qadar (the Divine Decree of destiny) when a trust becomes a way of making a profit, when people give to charity (Sadaqah) reluctantly, when adultery becomes widespread - when this happens, then your people will perish.'" 
'Imran ibn Husayn said,
"The Prophet (صلى الله علیه وسلم) said, 'Some people of this Ummah will be swallowed up by the earth, some will be transformed into animals, and some will be bombarded with stones.' One of the Muslims asked, 'When will that be, O Messenger of Allaah?' He said, 'When singers and musical instruments will become popular, and much wine will be drunk.'" 
 Narrated by Ibn Maajah, Kitaab al-Fitan (Hadeeth 4019), 2/1332.
Checker's Note: Saheeh, Silsilatul Ahadeeth as-Saheehah: 106-107.
 Tirmidhee, Abwaab al-Fitan (Hadeeth 308), 6/4620-458.
Checker's Note: Da`eef, Da`eef al-Jami as-Sagheer: 608.
 al-Haythami, Kitaab al-Fitan.
Checker's Note: al-Haythami, says, "al-Bazzar reports it and it contains narrators I do not know." We do not know the status of the hadeeth as no muhaddith (as far as we know) has given a definite verdict.
 Narrated by at-Tirmidhee.
Checker's Note: Saheeh, Silsilatul Ahadeeth as-Saheehah: 1604.