5 conditions of Hajj being obligatory: being Muslim, being of sound mind and being an adult - The Prophet (peace and blessings of Allah be upon him) said,
“The pen is lifted from three [and does not record their deeds]: from one who is sleeping, until he wakes up; from a child until he reaches puberty, and from one who is insane until he comes to his senses.” (Abu Dawood)
Being free - Hajj is not obligatory for a slave, because he is distracted by his duties towards his master, and being able to do it - Physically i.e. one is sound in body and can bear the hardship of travelling to the sacred House of Allah - Financially i.e. one has enough funds to get to the sacred House of Allah and back again.
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