Al Hajj : How Muslims Distorted Al Hajj ( The Pilgrimage )
“Finally, the Quranic terminology [Al Hajj al Akbar (or the Great Pilgrimage)] means only the opening of Al Hajj, but you can perform Al Hajj during all the four sacred months and even two days before and two days after these four months.
Al Hajj Al Akbar was the real opening of the Arabic lunar calendar which used to be the month of “Dul Hijjah”, means the month of the opening of Al Hajj. It used to be the first month of the Muslim Arabic calendar, then the other three sacred months that follow it.[ They are Muharram, Safar, Rabee’ Awwal].You can understand this if you read carefully these verses:[9: 1-2-3-5].
Muslims have ignored the sacred months and changed them.”