Every Muslim who has attained puberty and has sufficient means not only to undertake a journey to Mecca but also for the subsistence of his dependants during his absence, must once in his life time perform pilgrimage.
Kaaba is the edifice which was presented to God as a gift by His Prophets Abraham and Ishmael.
The rites for the pilgrimage begin on the 8th of the eleventh month and culminate into the Idd of Sacrifice on the 10th. (II:158, 196-203; III:97; V:3; XXII 26:33).
A muslim's journey to the House of God, and there seeking his Maker's forgiveness through expression of repentance and the performance of all the rituals attending pilgrimage, is a spiritual experience so overwhelming that the pilgrim's very soul appears to undergo a purification.
The pilgrimage has another philosophical aspect.
In the Quraan, like in the Old Testament, there is the story of Abraham having been commanded to sacrifice his son. The Quraan, however, states that the son was Ishmael.
The father communicates the message to the young lad who had just attained puberty. The lad exhorts the father to comply with the divine command adding, "God willing, you shall find me amongst the patient ones."
Unbeknown to the mother, the father and the son travel to the planes of Arafaa, a short distance from Mecca. There they spend the night in prayers. The following afternoon they travel to the town of Meena where the sacrifice was to take place. They spend the night on the outskirts of the town. The following morning they enter Meena.
On the way to the appointed place, the Satan tries thrice to lure them into abandoning the enterprise, but each time the father and the son chase him away by throwing pebbles at him.
When they get to the place of sacrifice, the father blindfolds his son saying that he did not wish the lad to see the anguish on the father's face. He then blindfolds himself for, as he reasoned, how could any father watch his son die ?
God saves Ishmael by substituting a ram and sends His salutations to Abraham for his act of obedience. God also promises Abraham to immortalize the event. (II:125-127; III:96-97; XXXVII:101-111).
The mother, on learning what had happened, screams and falls unconscious at the thought of what might have happened had Allah not intervened to save her beloved son. Shortly afterwards she dies and is buried close to Kaaba. Her burial place is treated as being included in the hallowed ground around which the pilgrim circumambulates.
Every pilgrim takes the same route which Abraham and Ishmael had taken. He too spends the first night, as they did, in Arafaa and the second night outside Meena. He too symbolically stones the satan at the three places in Meena.
While of-course the visit to the House of Allah has its own great spirituality, the pilgrim also must reflect upon the rituals which appear to enshrine family values, parents' love for their off-spring, the vanquishing of the satan, the one within man's heart, by symbolically stoning him and above all the willingness to make sacrifices for the pleasure of God.