How shrine of Ali (AS) was found?

Ali the great leader of Islam and first leader of Shiite people, became martyr in 40th HEJRI (Islamic calendar), that means, 30 years after the death of holy prophet (PBUH). His high flying spirit left the constrained world to reach the kingdom of God.
On the order of Imam Ali, his sons, HASAN and HOSEIN, buried his holy body on a high land which is called by Arab as NAJAF, and his buried place remained a secret.
Ali the great man, who broke the back of blasphemy with his bravery. A great iconoclast, who have spread the teachings of Islam throughout Arabia, because of his enemies, who were having old spite against him, his tomb remained secret for many years. And if enemies were finding his shrine, they could do any type of insult. So for about 150 years, only his sons and some selected students were knowing his buried place.
Now, let us see, how they discovered the grave, at the time of HARUNAL RASHID, when one day, caliph went outside of KUFA, for hunting a gazelle, a strange thing happened, caliph and his dogs were following the gazelles, but after reaching a place, a strange force was throwing away the dogs and dogs and caliph could not hunt, so HARUN wondered and did not find the answer for the issue, then called an old man who was known about the area very well. The old man said: if you promise not to kill me, I will talk. After promise of caliph, old man said: my grandfather told my father, this is the burial place of ALI BEN ABITALEB. When HARUN heard about the issue, he cried well and then made ablution and prayed.
By this way, God showed the shrine of Ali through his enemies.