Sheikh Mohammed Siam, who was also a former chancellor of the Islamic University in the Gaza Strip, died of a stroke on Friday, according to Sama news agency.
In 1988, Israel expelled the cleric because he wrote Hamas statements and was a senior member of the resistance group.
He lived in Sudan until 1994 before going to Yemen and acting there as a representative of Hamad.
After the start of clashes in Yemen in 2015, he returned to Khartoum.
In addition to being a preacher and writer, Siam was considered one of the most renowned Palestinian poets.