I saw the Messenger of Allah ﷺ throwing pebbles on the day of sacrifice while on his riding beast and saying: Learn your rites, for I do not know whether I am likely to perform Hajj after this occasion. (Using translation from Abū Dāʾūd 1970)
سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللهِ يَقُولُ رَأَيْتُ النَّبِيَّ ﷺ يَرْمِي الْجَمْرَةَ عَلَى رَاحِلَتِهِ يَوْمَ النَّحْرِ وَيَقُولُ لِتَأْخُذُوا مَنَاسِكَكُمْ فَإِنِّي لَا أَدْرِي لَعَلِّي لَا أَحُجَّ بَعْدَ حَجَّتِي هَذِهِ