This section is from the book "Stories From The Thousand And One Nights", by Edward William Lane and Stanley Lanepoole. Also available from Amazon: Stories From Thousand And One Nights: The Arabian Nights' Entertainments.
So poor 'Ala-ed-Din forgot his tiredness and the beating and the tears, and was dazzled at the words of the Moor, and rejoiced to think that he would become so rich that Kings would not be wealthier than he. And he said: "O my uncle, command me what thou wilt, and I will obey thy behest." And the Moor said to him: "O son of my brother, thou art like my own child, and more, since thou art my brother's son, and I have none of kin save thee; and thou art my heir and successor, O my son." And he approached 'Ala-ed-Din and kissed him, saying: "For whom should I design all these labours of mine, my child, except for thee, that I may leave thee a rich man, as rich as can be! Wherefore thwart me not in anything I tell thee, but go to that ring and lift it as I bade thee." And 'Ala-ed-Din said: O my uncle, this ring is too heavy for me; 1 cannot lift it alone; come and help me to raise it, for I am little in years." But the Moor replied: "O my brother's son, we can accomplish nothing if I aid thee, and our labours would be vain; put then thy hand to the ring and lift it, and the stone will come up immediately. Did I not tell thee that none can move it but thyself? Repeat thy name and the names of thy father and mother, whilst thou pullest, and it will come up at once, and thou wilt not feel its weight." So 'Ala-ed-Din summoned his strength and plucked up his courage, and set to work as his uncle had bidden him, and lifted the stone with perfect ease, after saying the names of himself and his father and mother as the Moor had counselled him. So he lifted the slab and cast it on one side.
And when he had lifted the slab from the door of the Treasury, before him lay a passage entered by a descent of twelve steps. And the Moor said to him: " 'Ala-ed-Din, pull thy wits together, and do exactly what I tell thee to the uttermost, and fail not a little from it. Descend carefully into yonder passage until thou reachest the end, and there shalt thou find a place divided into four chambers, and in each of these thou shalt see four golden jars and others of virgin gold and silver. Beware that thou touch them not nor take anything out of them, but leave them and go on to the fourth chamber, without even brushing them with thy clothes or loitering a single moment; for if thou do contrary to this thou wilt straightway be transformed and become a black stone. And when thou comest to the fourth chamber thou wilt find a door; then open the door, and repeating the names thou saidst over the slab, enter, and verily thou wilt pass thence into a garden full of fruit trees, whence thou wilt proceed by a path which thou wilt see in front of thee about fifty cubits long, and come upon an alcove1 in which is a ladder of about fifty steps, and thou shalt see, moreover, a Lamp suspended above the alcove. Take thou the Lamp, and pour out the oil therein, and put it in thy breast, and be not afraid for thy clothes, since it is but common oil. And on thy return thou mayest pluck what thou pleasest from the trees, for all is thine so long as the Lamp continue in thy hand." And when he had ended, the Moor took a signet ring from his finger and put it on 'Ala-ed-DuVs finger, and said: "My son, this ring will guard thee from all peril and fear that may behest thee, so long as thou obeyest all that I have told thee. Arise, therefore, forthwith and descend and pluck up thy courage, and strengthen thy resolve and fear not, for thou art a man now, and no longer a child. And after this, my boy, thou shalt speedily become possessed of riches galore, till thou art the richest man in the world".
So 'Ala-ed-Din arose and went down into the cavern and found the four chambers and the four golden jars therein, and these he passed by with all care and precaution, as the Moor had told him, and he came to the garden and went through it till he found the alcove, and climbing the ladder, he took the Lamp and poured out the oil and put it in his bosom, and went down into the garden, where he began to marvel at the trees with the birds on their branches singing the praises of their glorious Creator. And though he had not noticed it when he entered, these trees were all covered with precious stones instead of fruit, and each tree was of a different kind and had different jewels, of all colours, green and white and yellow and red and other colours, and the brilliance of these jewels paled the sun's rays at noontide. And the size of each stone surpassed description, so that none of the Kings of the world possessed any like the largest or half the size of the least of them. And 'Ala-ed-Din walked among the trees and gazed upon them and on these things which dazzled the sight and bewildered the mind, and as he examined them he perceived that instead of ordinary fruit the yield was of big jewels, emeralds and diamonds, and rubies and pearls, and other precious stones, such as to bewilder the understanding. But as he had never seen such things in his life, and had not reached mature years so as to know the value of such jewels (for he was still a little boy), he imagined that these jewels were all of glass or crystal. And he gathered pockets full of them, and began to examine whether they were ordinary fruit, like figs or grapes and other like eatables; but when he saw that they were of glass (knowing nothing of precious stones), he put some of each kind that grew on the trees into his pockets, and finding them of no use for food, he said in his mind: "I will gather these glass fruits and play with them at home." So he began plucking them and stuffing them into his pockets until they were full; and then, when he had picked more and put them in his girdle, and girded it on, he carried off all he could, intending to use them for ornaments at home, since he imagined, as has been said, that they were only glass. Then he hastened his steps, for fear of his uncle, the Moor, and passed through the four chambers, and came to the cavern, without as much as looking at the jars of gold, notwithstanding that on his way back he was permitted to take of them. And when he came to the steps, and ascended them till none remained but the last one, Which was higher than the others, he was unable to climb it by himself, without help, seeing that he was weighted. And he called to the Moor: " O my uncle, give me thy hand and help me to get up." And the sorcerer replied: "O my son, give me the Lamp, and lighten thyself; perhaps it is that which weigheth thee down." But he answered: " O my uncle, the Lamp doth not weigh me down at all; give me only thy hand, and when I am up I will give thee the Lamp." But since the wizard wanted only the Lamp, and nought beside, he began to urge 'Ala-ed-Din to give it him, which, since it was at the bottom of his dress and the bags of precious stones bulged over it, he could not reach to give it him; so the Moor pressed him to give what he could not, and raged furiously, and persisted in demanding the Lamp, when 'Ala-ed-Din could not get at it to give it him.