Protection and acceptance by Allah (SWT)

Immediately upon his appointment as the new Khaleefah Imam Mahdi will witness the direct Help of Allah. A man from the heart of Damascus, known as Sufyaani (from the family of Abu Sufyaan) will begin a horrendous campaign of bloodshed and killing, during which no tribe or community will be left alone. Even women and children will be mercilessly butchered. His chief supporters and followers will be the tribe of Kalb.
When this Sufyaani hears of Imam Mahdi, he will immediately dispatch an army towards Makkah (where the Mahdi will be). This army will be easily defeated by the Imam and his handful of followers. Then this Sufyaani will himself lead a contingent from Syria towards Makkah to fight against Imam Mahdi.
This army will be destroyed by an enormous earthquake at Baidaa, a place just after Zhul-Hulaifa, on the way to Makkah. First the rear of the army will be devastated, and when those in front go back to see what had happened, they too will meet the same fate. All but one member of this army will perish, and this sole survivor will take back the news of this disaster. There will be many in this army who had been brought along by force, people who did not intend to oppose Imam Mahdi. Such people would also be destroyed along with the others, but on Qiyaamat they will be raised up according to their intentions. When the story of Divine Help being granted to Imam Mahdi spreads through the Muslim world, the Abdaals of Syria and the pious people of Iraq will come to pledge allegiance to Imam Mahdi and join his ranks.
Similarly, other Muslim armies from Madinah and elsewhere will also come to Makkah and offer their support and allegiance to Imam Mahdi.
A man from the Quraish tribe will then emerge and oppose the Imam. This man also will have the backing of the tribe of Kalb. He too will send an army against Imam Mahdi, who will yet again, through The Grace of Allah, inflict heavy defeat on his enemies.
The Prophet of Allah actually castigated those who do not participate in this battle against theKalb. The inhabitants of the heavens and the inhabitants of the earth will be pleased with him.
It will be wajib upon all Muslims who hear of Imam Mahdi to pledge their allegiance and full support to him.