What is the ruling on praying in the Hajar Isma'il?

The questioner : Is it permissible to pray in the Hajar after the 'Asr prayer? And what is the difference between a voluntary prayer and an obligatory one?

The Shaykh : Yes, the question now asks about the time and the place. What is the place? The Hajar. And the time is 'Asr. It is well known that it is not permissible for a person to pray after 'Asr, except for an obligatory prayer that was missed or a voluntary prayer that has a specific reason.
As for standing up to perform a voluntary prayer after 'Asr, that is forbidden for him, because the Prophet (peace and blessings be upon him) prohibited it. A person cannot worship Allah with something that the Messenger (peace and blessings be upon him) has prohibited. Rather, what the Messenger (peace and blessings be upon him) has prohibited, we avoid, based on his saying (peace and blessings be upon him):
As for the place, which is the Hajar, there is no harm in praying the obligatory prayer and the voluntary prayer in it, according to the stronger opinion.
Because there is no evidence to distinguish between the obligatory prayer and the voluntary prayer. And because the Prophet (peace and blessings be upon him) said: Is the Hajar part of the land or not? And what do you say, my brother? From the land, but from the House. Yes, and the House is part of it. The House is good.
So the Hajar falls under the generality of the saying of the Prophet (peace and blessings be upon him): "I have made the earth a mosque and a place of purification for me."
And it is established from the Prophet (peace and blessings be upon him) that he a voluntary prayer.
The default is that what is established for a voluntary prayer is established for an obligatory prayer, unless there is evidence to distinguish them. Did you understand the answer now? Praying in the Hajar is permissible, whether obligatory or voluntary; they are the same.
The second point: Praying after 'Asr is not permissible, neither in the Hajar, nor in the Sacred Mosque other than the Hajar, nor in any place, except for two things: the obligatory prayer and the voluntary prayer that has a reason. For example, if a person enters the mosque after 'Asr, he prays the greeting of the mosque in whatever mosque it is.