Musnad Ahmad 317
It was narrated from Zaid bin Aslam, from his father who said:
I heard `Umar bin al-Khattab say: Why are we running now and uncovering our shoulders (in tawaf) when Allah has caused Islam to prevail and has eliminated kufr and its people? Whatever the case, we will never give up something that we did at the time of the Messenger of Allah (ﷺ).
حَدَّثَنَا عَبْدُ الْمَلِكِ بْنُ عَمْرٍو، حَدَّثَنَا هِشَامُ بْنُ سَعْدٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ أَبِيهِ، قَالَ سَمِعْتُ عُمَرَ بْنَ الْخَطَّابِ، رَضِيَ اللَّهُ عَنْهُ يَقُولُ فِيمَا الرَّمَلَانُ الْآنَ وَالْكَشْفُ عَنْ الْمَنَاكِبِ وَقَدْ أَطَّأَ اللَّهُ الْإِسْلَامَ وَنَفَى الْكُفْرَ وَأَهْلَهُ وَمَعَ ذَلِكَ لَا نَدَعُ شَيْئًا كُنَّا نَفْعَلُهُ عَلَى عَهْدِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ‏.‏