Definition: Ucqais in Islamic context signifies a person who is not allowed to act as a prophet or messenger, often because he/she is considered infallible or has been recognized by Allah as such, thus preventing him/her from being confused with others in the same group or community. It's important to note this term historically was used to exclude certain types of Muslims from leadership positions, including those deemed apostate or unable to fulfill their responsibilities effectively due to infallibility.