Assuming a caliph has been appointed for Muslims (like this one), is it obligatory for a Muslim to pledge allegiance to a caliph if he is uncertain?
from what I read in hadiths: Ali did not pledge allegiance to Abu Bakr for a full 6 months and also there were some tribes who did not pay allegiance. Also during the time of Husain there were many pious people who did not pledge alligience to any person , neither Husain nor Yazid ,so the question is it Ok to go without pledge of allegiance and die in that state assuming that a khalifa exists ?