The status of Hajj in Islam, and the conditions of it being obligatory

Should he do Hajj on behalf of his deceased father who did Hajj, or on behalf of his elderly mother who has not yet done Hajj?

It is not valid to do the farewell tawaaf until after completing Hajj

It is not stipulated that fasts be observed consecutively for one who cannot find a hadiy

He forgot to fast the third day during Hajj and fasted it after he returned home

Is it haram to buy and sell after the farewell tawaf?

He wants to offer naafil prayers after praying Zuhr and ‘Asr in ‘Arafah

Does the pilgrim have to offer the Eid prayer for Eid al-Adha?

If a person stays outside Mina and the sun sets on the second day, does he have to hasten (to depart)?

What is the ruling on climbing up Jabal al-Rahmah (the Mount of Mercy) on the day of ‘Arafah and praying atop this mountain?