mo'iddin arabi, in the 3rd volume of his «futuhaat makkia» (chapter no. 366) says: «certainly Allah possesses a vicegerent who shall appear when the earth will be filled with cruelty and oppression and then he shall fill it with equity and justice. if there remains not more than a day from the life of the earth, Allah will set the day so long until this vicegerent from the progeny of the holy prophet (s.a.w.a.) and offspring of fatemah (a.s.) appears.»
author of «eqdud-durar» in the preface of the afore-said book, after reproaching about the situation at that time and the excessiveness in seditions and disturbances says: some reckon that these circumstances will always continue whereas such kind of people have followed the superficial or external aspect of (only) some of the traditions. then i said these traditions are worthy of our acceptance and we are bound to accept and follow them. however, there is nothing in these traditions which give indication to the continuity of those circumstances until the day of qiyamat (the last day). it seems that the obviation of seditions and appearance of comforts will occur at the time when imam Mahdi shall manifest himself because, many traditions which the 'ulemas' and scholars have brought in their books have given glad-tidings of his manifestation and the fact that god shall appoint a person who will be provided for his kingdom, such means which could shake the mountains and his kingdom will spread far and wide.
so he shall rule the entire earth and fill it with equity and justice. at that time will be revealed the hidden treasures and when the powerful appear, he shall present them to the people....
author of «yanabi-ul-muwadda» on page 410 writes: shaikh kamaluddin-ibn-thalha in his book «durrul-munazzam» says as such: 'as per research, there is for Allah a vicegerent who shall appear at the end of time when the earth will become filled with cruelty and oppression and indeed he shall fill it with equity and justice. if there remains not more than a day from the life of the earth, he shall make this vicegerent to appear from the offspring of fatemah zahra. men of disposition shall recognize him by his protracted nose, black eye-lashes and a spot on his right cheek. his name shall be muhammad; his height above medium, his face handsome and his hair beautiful in appearance. through him, Allah shall soon destroy the innovations (in religion), make upright every living thing and satiate his soldiers from the land of eden. the most prosperous before him will be the people of kufa. he shall distribute the booties equally and deal with people righteously and during his time altercations shall vanish. the clouds shall not allow but rains to descend and the land except to flourish. this imam is the same Mahdi, the upholder of the commands of Allah to such extent that he will banish all the false religions. then there shall remain no religion but the pure one(s)....
author of «yanabi-ul-muwadda» on page 432 has narrated from sharif allama samhoudi from his book «jawahar-ul-nagdin» the following:
'as per research, blessing of the holy prophet's prayers at the time of ali's marriage with fatemah has been manifested in the offspring of hassan and hussein because, from their generation were those who have passed away and are those who shall come (in future). and if nobody comes in the future except imam Mahdi it will be sufficient (i.e. for fulfillment of the promises and bringing into order the chaotic conditions).
ibn athir jazari in his book «nehaya» while explaining the word «jalâ» writes: «about the qualities of Mahdi it has been said that he is «ajlal-jibha» and that is the delicate hair between the eyes and ears from above and he will be the one who shall put up his hair from his face.»
also, in explaining the word of «hudâ» he says: Mahdi is the one who has been guided by Allah towards the truth. this quality has been utilised in names to such extent that it has become like the names which out of prevalence, have found nominal meaning and for this reason has been named as Mahdi, the one whom the holy prophet has given glad-tidings about his coming at the end of time.(19)
in the second volume of fotouhat-e-islamiah, on page 322 the author after specifying this point that traditions about Mahdi are to such extent that takes one to the level of certitude, says: «what is sure in this regard is that his manifestation is certain. surely, he shall be from the offspring of fatemah and he will fill the earth with justice.». thereafter he says: sayyid muhammad-ibn-rasul barzanji has referred to this very matter in his book «al-asha'ah».
ibn-abil hadeed in his commentary of nahjul-balagha in the second volume on page 535, while mentioning some of hazrat's speeches (which was previously narrated and we hinted in them the subject of Mahdi) he says: as per research, all the muslim sects are unanimous in their opinion that the world and obligation shall not end but after the advent of Mahdi who shall come at the end of time.