He did Hajj then he stopped praying; should he do Hajj again?
Question

                A man did Hajj, then later on he became negligent about prayer and stopped praying. Then he repented after that. Is his first Hajj valid and does it count as the Hajj of Islam (obligatory Hajj), or does he have to do Hajj again?.
Praise be to Allah.
    If a person does Hajj when he is a kaafir in the sense of 
    major kufr, then after that he becomes a Muslim, that Hajj does not count as 
    the obligatory Hajj, but if a person was a Muslim, then he apostatized by 
    doing something that puts one beyond the pale of Islam, then he repented and 
    returned to Islam, that Hajj does count as the obligatory Hajj for him, 
    because he did Hajj when he was a Muslim. The Qur’aan indicates that the 
    good deeds of an apostate before he apostatizes are only erased if he dies 
    in kufr, because Allaah says (interpretation of the meaning): 

    “And whosoever of you turns back from his religion and 
    dies as a disbeliever, then his deeds will be lost in this life and in the 
    Hereafter, and they will be the dwellers of the Fire. They will abide 
    therein forever”

    [al-Baqarah 2:217]

    And Allaah is the Source of strength. May Allaah send 
    blessings and peace upon our Prophet Muhammad and his family and companions. 
    End quote. 

    Standing Committee for Academic Research and Issuing Fatwas 

    Shaykh ‘Abd al-‘Azeez ibn ‘Abd-Allaah ibn Baaz, Shaykh ‘Abd 
    al-Razzaaq ‘Afeefi, Shaykh ‘Abd-Allaah ibn Ghadyaan, Shaykh ‘Abd-Allaah ibn 
    Qa’ood.