Allah said:

﴿الْحَجُّ أَشْهُرٌ مَّعْلُومَـتٌ﴾

(The Hajj is (in) the well-known months.)

This Ayah indicates that Ihram for Hajj only occurs during the months of Hajj. This was reported from Ibn `Abbas, Jabir, `Ata', Tawus and Mujahid. The proof for this is Allah's statement that Hajj occurs during known, specific months, which indicates that Hajj is not allowed before that, just as the prayer has a fixed time (before which one's prayer is not accepted).

Ash-Shafi`i recorded that Ibn `Abbas said, "No person should assume Ihram for Hajj before the months of the Hajj, for Allah said:

﴿الْحَجُّ أَشْهُرٌ مَّعْلُومَـتٌ﴾

(The Hajj is (in) the well-known months.)

Ibn Khuzaymah reported that Ibn `Abbas said, "No Ihram for Hajj should be assumed, except during the months of Hajj, for among the Sunnah of Hajj is that one assume Ihram for it during the Hajj months. '' This is an authentic narration and the Companion's statement that such and such is among the Sunnah is considered as a Hadith of the Prophet , according to the majority of the scholars. This is especially the case when it is Ibn `Abbas who issued this statement, as he is the Tarjuman (translator, interpreter, explainer) of the Qur'an.

There is a Hadith about this subject too. Ibn Marduwyah related that Jabir narrated that the Prophet said:

«لَا يَنْبَغِي لِأَحَدٍ أَنْ يُحْرِمَ بِالْحَجِّ إِلَّا فِي أَشْهُرِ الْحَج»

(No one should assume Ihram for Hajj, but during the months of Hajj.)

The chain of narrators for this Hadith is reasonable. Ash-Shafi`i and Al-Bayhaqi recorded this Hadith from Ibn Jurayj who related that Abu Az-Zubayr said that he heard Jabir bin `Abdullah being asked, "Does one assume Ihram for Hajj before the months of the Hajj'' He said, "No.'' This narration is more reliable than the narration that we mentioned from the Prophet . In short, this statement is the opinion of the Companion, supported by Ibn `Abbas' statement that it is a part of the Sunnah not to assume Ihram for Hajj before the months of the Hajj. Allah knows best.