What are the things which nullify Hajj?
Hajj is not nullified except by engaging in sexual intercourse, vaginal or otherwise, before making partial release from ihram. This is based on the words of God the Almighty Who says,
Let there be no sexual relations [with your wives], nor transgressions, nor wrangling in the Hajj. [Al-Baqarah, 197]
Engaging in sexual intercourse is not a reason for discontinuing hajj and a pilgrim who does this is to complete the rest of the rites and perform a make-up hajj and sacrifice a hady the following year. Hajj is not nullified for a pilgrim who engages in sexual intercourse after partial release from ihram and before full release from it and he is obliged to make expiation.
Continuing an act of worship which has become nullified is particular only to hajj and does not extend to other acts of worship.
A pilgrim who misses standing at ‘Arafat, has forfeited his hajj due to the words of the Prophet who said, “The hajj is ‘Arafat.” He must release himself from ihram for hajj by making a ‘umrah instead, and is obliged to perform a make-up hajj and slaughter a hady the following year.
Staff of Dar al-Iftaa al-Misriyyah