What is the ruling of the person who does Hajj with haraam money?
One should do Hajj with halaal money. If one wants the reward of Hajj, then he must do it with halaal money.
If, however, someone ends up doing Hajj with haraam money, then the Hajj will be valid though devoid of reward. This is the opinion of the majority of scholars.
Ahmad opposed the majority and said that the Hajj will not be valid.