What is the ruling on the Hajj of one who authorized another to stand at Arafat on his behalf due to his inability to reach it because he is paralyzed, knowing that he performed the circumambulation (Tawaf) and the striving (Sa'i) using a device and delegated the throwing of the pebbles (Ramy)?

It is not permissible to appoint a proxy for the standing at Arafat. Whoever appoints someone else for it must perform another Hajj the following year, because standing at Arafat is a fundamental pillar of Hajj, and whoever misses it has missed Hajj. Its status as a pillar is established by the Qur'an, Sunnah, and scholarly consensus, such as Allah's saying: "Then depart from wherever the people depart" and the hadith: "Hajj is Arafat." So, whoever misses the standing at Arafat, whether intentionally, forgetfully, or out of ignorance, until the dawn of the Day of Sacrifice, their Hajj is invalid. They must then exit the state of ihram by performing an 'umrah, and then perform Hajj the following year.