I saw Allah's Apostle ﷺ flinging pebbles while riding his camel on the Day of Nahr, and he was saying: Learn your rituals (by seeing me performing them), for I do not know whether I would be performing Hajj after this Hajj of mine. (Using translation from Muslim 1297)
أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللهِ يَقُولُ رَأَيْتُ النَّبِيَّ ﷺ يَرْمِي عَلَى رَاحِلَتِهِ يَوْمَ النَّحْرِ يَقُولُ لِتَأْخُذُوا مَنَاسِكَكُمْ فَإِنِّي لَا أَدْرِي لَعَلِّي أَنْ لَا أَحُجُّ بَعْدَ حَجَّتِي هَذِهِ