Narrated Sa'id ibn al-Musayyab:

A man from the Companions of the Prophet ﷺ came to Umar ibn al-Khattab (may Allah be pleased with him). He bore witness before him that when he (the Prophet) was suffering from a disease of which he died he heard the Messenger of Allah ﷺ prohibiting performing of umrah before hajj.

حَدَّثَنَا أَحْمَدُ بْنُ صَالِحٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي حَيْوَةُ، أَخْبَرَنِي أَبُو عِيسَى الْخُرَاسَانِيُّ، عَنْ عَبْدِ اللَّهِ بْنِ الْقَاسِمِ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ رَجُلاً، مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَتَى عُمَرَ بْنَ الْخَطَّابِ - رَضِيَ اللَّهُ عَنْهُ - فَشَهِدَ عِنْدَهُ أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ فِي مَرَضِهِ الَّذِي قُبِضَ فِيهِ يَنْهَى عَنِ الْعُمْرَةِ قَبْلَ الْحَجِّ .