Eid-ul-Adha ("Feast of the Sacrifice"), also known as the Great Eid, is the second most important festival of the Muslim calendar.
The festival recalls the prophet Ibrahim's willingness to sacrifice his son when God ordained him.
The story of Ibrahim's sacrifice
Eid-ul-Adha celebrates the occasion when God appeared to Abraham in a dream and asked him to sacrifice his son Ishmael as an act of obedience to God.
The devil tempted Ibrahim, saying that he should disobey God and spare his son. As Ibrahim was about to kill his son, because God stopped him and gave him a lamb for the sacrifice instead.
This story is also found in the Jewish Torah and the Christian Old Testament (Genesis 22). Here, God asked Abraham to sacrifice his son Isaac, his son to Sarah. Ishmael was his son with Hagar.
Eid ul Adha is a public holiday in Muslim countries.
Today the Muslims of the world who can afford to sacrifice a sheep (sometimes a goat) as a reminder of Abraham's obedience to God. In Britain, the animal has to be killed in a slaughterhouse.
They share the flesh between family, friends and the poor.
Eid usually begins with the Muslims go to the mosque for prayers, dressed in their best clothes, and thanking God for all the blessings they have received.
It is also a time when visiting family and friends as well as offering gifts.
At Eid it is mandatory to give an amount of money to the charity to be used to help poor people buy new clothes and food so that they too can celebrate.
The Hajj is the pilgrimage to Mecca.
It is the fifth pillar of Islam and therefore a very important part of the Islamic faith.
All physically fit Muslims who can afford to pay must visit Mecca in Saudi Arabia at least once in their lives.
Every year around 2 million Muslims from all over the world converge to Mecca.
They stood before the Kaaba, a shrine built by Ibrahim praising God together.
The Hajjis or pilgrims wear simple white garments called Ihram that promote the ties of brotherhood and Islamic brotherhood, showing that all are equal in the eyes of God.
During the Hajj, pilgrims perform acts of worship and renewal of faith and a sense of purpose in the world.
The IRIB welcomes this opportunity, warmly welcomes all Muslims from all over the world and calls on Allah to lead us on the straight path with successes, peace, harmony, happiness, blessings, security, progress and prosperity.