Preference to follow the Prophet ﷺ over others when the rulings are known
he had heard a man from Ash-Sham asking Abdullah bin Umar about Tamattu after Umrah until Hajj, so Abdullah bin Umar said: "It is lawful." The man from Ash-Sham said: "But your father prohibited it." So Abdullah bin Umar said: "Is the order to follow my father or is the order (to follow) for the Messenger of Allah?" The man said: "Rather it is for the Messenger of Allah." So he said: "Indeed the Messenger of Allah did it."
أَنَّهُ سَمِعَ رَجُلاً مِنْ أَهْلِ الشَّامِ وَهُوَ يَسْأَلُ عَبْدَ اللَّهِ بْنَ عُمَرَ عَنِ التَّمَتُّعِ بِالْعُمْرَةِ إِلَى الْحَجِّ فَقَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ: هِيَ حَلاَلٌ. فَقَالَ الشَّامِيُّ: إِنَّ أَبَاكَ قَدْ نَهَى عَنْهَا. فَقَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ: أَرَأَيْتَ إِنْ كَانَ أَبِي نَهَى عَنْهَا وَصَنَعَهَا رَسُولُ اللَّهِ ﷺ أَأَمْرَ أَبِي نَتَّبِعُ أَمْ أَمْرَ رَسُولِ اللَّهِ ﷺ؟ فَقَالَ الرَّجُلُ: بَلْ أَمْرَ رَسُولِ اللَّهِ ﷺ. فَقَالَ: لَقَدْ صَنَعَهَا رَسُولُ اللَّهِ ﷺ.