حَدَّثَنَا عَبْد اللَّهِ قَالَ وَجَدْتُ فِي كِتَابِ أَبِي حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ وَحَجَّاجٌ قَالَ مُحَمَّدٌ حَدَّثَنَا شُعْبَةُ وَقَالَ حَجَّاجٌ حَدَّثَنِي شُعْبَةُ عَنْ سِمَاكٍ الْحَنَفِيِّ قَالَ سَمِعْتُ ابْنَ عُمَرَ يَقُولُ إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَلَّى فِي الْبَيْتِ وَسَتَأْتُونَ مَنْ يَنْهَاكُمْ عَنْهُ
مسند امام احمد بن حنبل · Hadith 5066
It was narrated that Simaak al-Hanafi said: I heard Ibn 'Umar say: The Messenger of Allah (PBUH) prayed inside the Ka'bah, but there will come some who would forbid you to do so.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020