In The Name Of Allah Most Gracious Most Merciful
Assalaamu alaykum wa rahmatuallahi wa barakatuhu
 

The kingdom will belong to Quraysh.

Al-Tirmidhi HadithHadith 5992 Narrated byAbuHurayrah
Allah’s Messenger (peace be upon him) said, “The kingdom will belong to Quraysh, the legal authority to the Ansar, the office of making the call to prayer to the Abyssinians, and faithfulness to Azd,” i.e. the Yemen. In a version it is in mawquf form. Tirmidhi said, the mawquf is sounder Tirmidhi transmitted it, saying this (mawquf) is sounder.

*The kingdom will belong to Quraysh in Arabia

Sahih Muslim HadithHadith 4568 Narrated byAbuSa’id al-Khudri
The Messenger of Allah (peace be upon him) said: When oath of allegiance has been taken for two caliphs, kill the one for whom the oath was taken later.
*Note:Because the other one has no right take office of caliphate when one caliph has already been choosen.
 

Allah Knows Best