Sahih muslim:1333j Chapter: What one who has entered Ihram for Hajj or Umrah is permitted to wear, and what is not permissible, and perfume is forbidden for him Book 15, Hadith 453

‘A’isha (Allah be pleased with her) reported: I asked Allah’s Messenger (ﷺ) about the wall, circumpassing the House (i. e. whether the wall on the side of Hijr was included in the Ka’ba). He said, Yes. I said: Then why did they not include it in the House? He said: ‘Your people ran short of the means (to do so). I said: Why is it that the level of its door is raised high? He said: Your people did it so that they should admit one whom they liked, and forbid him whom they disliked, and if your people were not new converts to faith, and I did not apprehend that their hearts would feel agitated at this. I would have definitely included (the area of) this wall-in the House and would have brought the door to the level of the ground.