Hajj on behalf of another

A person who cannot perform Hajj or �Umrah as a result of old age, permanent illness, or some weakness in his body due to which he cannot make the journey, should have somebody perform Hajj and �Umrah on his behalf, and this is valid for him even if he regains his health after his representative had already entered into the state of Ihram for Hajj or �Umrah. On the authority of al-Fadl Ibn �Abbas t: A woman from al-Khath�am said,
�O Messenger of Allah, the obligation from Allah to perform Hajj came upon my father while he is very old and incapable of riding a camel.�
The Prophet ﷺ said:
�Perform Hajj on his behalf.�
[ Source: At-Tirmidhi.]There are numerous conditions stipulated for the person performing Hajj on behalf of another:1- He must have met the aforementioned conditions of Hajj.2- He must have first performed Hajj for himself. When a person performs Hajj on behalf of another, but has not performed it for himself, such a Hajj on behalf of another person is not valid; thus the Hajj he performed for the other person then becomes for him, and it is considered as a valid Hajj for him in Islam. Evidence for this is what was confirmed on the authority of Ibn �Abbas t: The Prophet ﷺ heard a man saying;
�Labbayka on behalf of Shubruma,� the Prophet ﷺ asked: �Who is Shubruma?� He replied: �A brother or a relative of mine.� The Prophet then asked: �Have you performed Hajj for yourself?� He replied: �No.� So the Prophet ﷺ said: �Perform Hajj for yourself, then perform (Hajj) on behalf of Shubruma.�
[ Source: Abu Dawud.]
Source: islamkingdomhajj