Al-Kāfi - The Book of Haj

َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدٍ عَنْ عَلِيِّ بْنِ الْحَكَ٠ِ عَنِ الْحُسَيْنِ بْنِ أَبِي الْعَلاءِ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ السَّلاَ٠) وَذَكَرْتُ الصَّلاةَ فِي الْكَعْبَةِ قَالَ بَيْنَ الْعَ٠ُ عَلَى الْبَلاطَةِ الْحَ٠ْرَاءِ فَإِنَّ رَسُولَ الله (صلَّى اللهُ عَلَيْهِ وَآلِه) صَلَّى عَلَيْهَا ثُ٠َّ أَقْبَلَ عَلَى أَرْكَانِ الْبَيْتِ وَكَبَّرَ إِلَى كُلِّ رُكْنٍ ٠4.

Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from al-Husayn ibn abu al-‘Ala’ who has said the following: “I once spoke to abu ‘Abd Allah (a.s.), about performing salat (prayer) inside al-Ka‘bah. He (the Imam) said, ‘Perform salat (prayer) between the two pillars on the red marble; the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, performed salat (prayer) there.

Thereafter go to the corners of the House and say Takhir (Allah is great beyond description) in every corner.’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (18/226))