Thawbān (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "Allah brought the corners of the earth together for me, so I saw its eastern and western parts. The dominion of my Ummah will definitely reach as far as what was brought together for me (all parts of the world). I have been granted the two treasures, the red and the white. I asked my Lord not to destroy my Ummah due to a common drought nor to afflict them with an enemy from other than themselves who would annihilate them. My Lord said: 'O Muhammad, when I pass a decree, it is not retracted. I have granted that I will not destroy your Ummah by a common drought, nor will I release against them an enemy from other than themselves, who will annihilate them - even if the people from the surrounding regions join forces against them - until they themselves kill and capture each other.'"
Al-Burqāni narrated this Hadīth in his Sahīh with this addition: "I only fear for my Ummah the misguiding leaders. If the sword falls upon them, it will not be lifted until the Day of Resurrection. The Hour will not be established until a community from my Ummah join the polytheists and until large groups from my Ummah worship idols. There will be in my Ummah thirty impostors, each of them claiming to be a prophet. I am the seal of the prophets; there will be no prophet after me. A group from my Ummah will continue to uphold the truth and be victorious, regardless of those who let them down (did not support them), until the command of Allah, Exalted and Glorified, comes.''
Authentic hadith -
Narrated by Ibn Majah - Narrated by Abu Daoud - Narrated by Ahmad - Narrated by Muslim