Salam Alaykum,
This is just some of the Hadiths from sunni sources proving the Khalifa should be selected by Allah swt.
When your Lord said to the angels: Indeed, I am placing a vicegerent in the Earth. (2:30)
Ibn Kathir records:
“Al-Qurtubi, as well as other scholars, said that this Ayah (2:30) proves the obligation of appointing a Khalifah to pass judgements on matters of dispute between people, to aid the oppressed against the oppressor, to implement the Islamic penal code and to forbid evil. There are many other tasks that can only be fulfilled by appointing the Imam, and what is necessary in performing an obligation, is an obligation itself”
“The affairs of the people will continue to be conducted as long as they are governed by twelve men, he then added from Quraish”
Sahih Muslim, Hadith number 4478 English translation by Abdul Hamid Siddiqui
”O David! We did indeed make thee a vicegerent on earth” Surah Sad verse 26
All above clearly proving that Allah selects the Khalifa. My information on Imamate mostly taken from http://www.answering-ansar.org/answers/ … /chap5.php
Mohammed_ak