That particular Jinnees presided over particular places, was an opinion of the early Arabs. It is said in the Ḳur-án, "And there were certain men who sought refuge with certain of the Jinn."[82] In the Commentary of the Jeláleyn, I find the following remark on these words:--"When they halted, on their journey, in a place of fear, each man said, 'I seek refuge with the lord of this place, from the mischief of his foolish ones!'" In illustration of this, I may insert the following tradition, translated from El-Ḳazweenee:--"It is related by a certain narrator of traditions, that he descended into a valley, with his sheep, and a wolf carried off a ewe from among them; and he arose, and raised his voice, and cried, 'O inhabitant of the valley!' whereupon he heard a voice saying, 'O wolf, restore to him his sheep!' and the wolf came with the ewe, and left her, and departed."--The same opinion is held by the modern Arabs, though probably they do not use such an invocation.--A similar superstition, a relic of ancient Egyptian credulity, still prevails among the people of Cairo. It is believed that each quarter of this city has its peculiar guardian-genius, or Agathodæmon, which has the form of a serpent.[83] It has already been mentioned that some of the Jinn are Muslims; and others, infidels. The good Jinn acquit themselves of the imperative duties of religion; namely, prayers, alms-giving, fasting during the month of Ramaḍán, and pilgrimage to Mekkeh and Mount 'Arafát: but in the performance of these duties they are generally invisible to human beings. Some examples of the mode in which good Jinn pay the alms required of them by the law, I have given in a former work.[84] Of the services and injuries done by Jinn to men, some account must be given.