Abul `Abbas is Khidr salla, whom Allah mentioned in the Holy Qur’an [18:65f.] as the servant of Allah who met with the Prophet Musa salla. He preserved and maintained the Reality of the Golden Chain until the next link in the Chain, `Abdul Khaliq, could assume his destined station.
Imam Bukhari relates in the Book of Prophets that the Prophet salla said, “Al-Khidr (‘the Green Man’) was so named because he sat on a barren white land once, after which it turned luxuriantly green with vegetation.”
The important role of Khidr as the murshid (initiator) of saints may be illustrated by the importance of his role as the murshid of prophets, particularly of the Prophet Musa salla. Moses was a highly powerful prophet, one of the five greatest ones whom Allah sent to this world: Noah, Abraham, Moses, Jesus, and Muhammad, Peace and blessings be upon them. Yet despite Moses’ elevated knowledge, Allah caused him to be in need of Khidr, even though Khidr was not a prophet. This is to teach us, as Allah said in the Holy Qur’an, that “Above every knower there is a greater knower” (Yusuf, 76).
The story of Moses’ encounter with Khidr is related in Surat al-Kahf (65-82) and goes thus: Moses and his servant found one of Allah’s servants whom Allah had honored uniquely and had taught knowledge from His Own Presence. Moses said to him, “I would like to accompany you.” He answered him: “You cannot bear to accompany me.” Moses was surprised and insisted he was able to do so. Khidr said: “You cannot, but if you do, do not ask about what I am doing no matter what you see me do. On that condition alone you may follow; but if you wish to ask questions, don’t follow me.” This meant that Khidr was going to do something that Moses would not understand, although he was the Messenger of a great religion. He was in need of Khidr to teach him something.
They took a boat and crossed the Tiberias River in Palestine. When they had reached the middle of the river, Khidr made a hole in the boat in order for it to sink. Moses was unable to keep silent, saying: “Why are you doing this childish act? Those people gave you the boat, are you now scuttling it?” Khidr replied: “Did I not tell you you would be unable to keep company with me?” Moses had not yet understood, even though he was a prophet and could read hearts, that there was something taking place that he did not know. They continued and found a young boy. As soon as they saw him, Khidr killed him. Moses said: “What are you doing? You sank a boat, and now you kill a child? This is against all laws!” Again Khidr said: “Did I not tell you you could not keep company with me? The third time you ask me, we will part ways.” Then they reached a city where they asked for food. No one gave them any food, and they threw them out. On their way, they found a wall on the verge of collapse. Khidr rebuilt that wall and made it straight. Moses asked: “Why are you doing this? No one accepted us as their guests in this city, and yet you are building their wall for them?” Khidr said: “This is the point where we separate, for you did not understand the wisdom of what I am doing.”
“O Moses, what we do is what Allah tells us to do. First I caused this boat to sink because there is a tyrant who is seizing every boat from the poor people on this side of the city. In order for these people not to lose their boat, I made it sink. That tyrant is going to die tomorrow, and tomorrow they can retrieve their boat and use it safely. I killed the child because Allah did not want that child to cause his parents, who believe in you, to leave and run away from your religion. Allah will give them better children than him. I built the wall which belonged to a man who was in life very generous to the poor. When he passed away, he left a treasure buried under the wall for his two orphans. Were that wall to come down, people would see the treasure and take it. I restored it in order for the two children to receive their treasure later. You did not understand God’s wisdom.”
That was Moses who, with all the honor bestowed on him by God, found himself ignorant before Khidr. How can we, who know so little in comparison to Moses, consider ourselves knowledgeable if Moses himself, with all his knowledge in the Divine Presence, was unable to understand certain things? This is a lesson in humility for human beings, and particularly for scholars and religious leaders: “Your knowledge is not worth mentioning. There are others more and highly more knowledgeable than you. As high or deep as you travel into knowledge, there is deeper depth and higher height than where you stand.”
That is why, when someone sits to give advice, he must sit with complete humbleness and complete respect for the listener. He cannot consider himself higher than them, otherwise that light will never reach their hearts. That is also why each is in need of a guide, as was shown by the Guide of guides himself, the Prophet salla, when he took Jibril salla as a guide for Revelation, and when he took a guide in traveling to Madina.
Source : http://naqshbandi.org