There are many Hadeeth which speak about the virtues of Hajj, including the following:

1. It is narrated by Abu Hurayrah, that the Messenger of Allaah sallallaahu 'alayhi wa sallam was asked which deed was best, so he replied, “Belief in Allaah and His Messenger.” He was asked, then what (was the next best deed), and he said, “Jihaad for the sake of Allaah.” He was asked, then what (after that) and he sallallaahu 'alayhi wa sallam replied, “An accepted Hajj.” (Bukhaari & Muslim)

An accepted Hajj denotes that:

1. It must be paid for with legal earnings.
2. One should keep away from evil, sin and unjust disputes during it.
3. One should observe all the rituals according to the Sunnah.
4. One should not show off by doing Hajj – it should be purely and sincerely for the sake of Allaah.
5. One should not follow it with acts of disobedience and sin.
1. Abu Hurayrah, may Allaah be pleased with him, said: “I heard the Prophet sallallaahu 'alayhi wa sallam say: “Whoever does Hajj for the sake of Allaah and does not have sexual relations (with his wife), nor commits a sin or disputes unjustly during the Hajj, will come back (free from all sins) like the day his mother gave birth to him.” (Bukhaari & Muslim)
2. Abu Hurayrah, may Allaah be pleased with him, also reported that the Prophet sallallaahu 'alayhi wa sallam said, “From one ‘Umrah to another is an expiation for the sins committed between them, and the accepted Hajj has no less a reward than Paradise.” (Bukhaari & Muslim)
3. ‘Aa’ishah, the Mother of the Believers, may Allaah be pleased with her, asked the Prophet sallallaahu 'alayhi wa sallam, “O Messenger of Allaah, can we not go out on campaigns and fight in Jihaad with you?” He said, “But the best and most beautiful of Jihaad is an accepted Hajj.” ‘Aa’ishah said, “I never stopped going for Hajj after I heard that from the Messenger of Allaah sallallaahu 'alayhi wa sallam.” (Bukhaari)
4. ‘Amr Ibn Al-‘Aas, may Allaah be pleased with him, reported that the Messenger of Allaah sallallaahu 'alayhi wa sallam said, “Hajj wipes out whatever (of sins) came before it.” (Muslim)
5. ‘Abdullaah Ibn Mas’ood narrated that the Messenger of Allaah sallallaahu 'alayhi wa sallam said, “Keep on doing Hajj and ‘Umrah, for they eliminate poverty and sin just as the bellows eliminate impurities from iron, gold and silver.” (Tirmidhi & An-Nasaa’i)
6. Ibn ‘Umar, may Allah be pleased with him, reported that the Prophet sallallaahu 'alayhi wa sallam said: “The one who fights for the sake of Allaah and the pilgrim who goes for Hajj or ‘Umrah are all guests of Allaah. He called them and they responded; they ask of Him and He will give them.” (Ibn Maajah)

Allaah says which means, “That they may witness (i.e., attend) benefits for themselves…” (Al-Hajj: 28) The benefits of Hajj are both worldly and religious (spiritual). With regard to the religious benefits, the one who goes for Hajj earns the pleasure of his Lord and comes back with all his sins forgiven. He also earns immense reward, which he cannot earn in any other place; one prayer in Al-Masjid al-Haraam (i.e., the Sacred Mosque in Makkah), for instance, is equal to a hundred thousand prayers elsewhere, and Tawaaf (circumambulation of the Ka’bah) and Sa’ee (pacing between Safa and Marwah) cannot be done anywhere else. Other benefits include meeting other Muslims and discussing their circumstances, encountering scholars and learning from them and asking them about one’s problems. Whereas the worldly benefits include trade and business, as well as other kinds of earnings that have to do with Hajj.