[Machine] The first person to level the mosque of the Messenger of Allah ﷺ was Umar ibn al-Khattab. He said, "Level it from the blessed valley," meaning al-Aqiq. This is what Urwah reported, and the narration of Ibn Umar is continuous and its chain of transmission is acceptable.
أَوَّلُ مَنْ بَطَحَ الْمَسْجِدَ مَسْجِدَ رَسُولِ اللهِ ﷺ عُمَرُ بْنُ الْخَطَّابِ ؓ وَقَالَ ابْطَحُوهُ مِنَ الْوَادِي الْمُبَارَكِ يَعْنِي الْعَقِيقَ كَذَا قَالَ عُرْوَةُ وَحَدِيثُ ابْنِ عُمَرَ مُتَّصِلٌ وَإِسْنَادُهُ لَا بَأْسَ بِهِ