It was narrated from Muhammad bin Jubir bin Mutim that his father:

"I lost a camel of mine, so I went to look for it in Arafat on the day of Arafat. I saw the Prophet (ﷺ) standing there and said: 'what is he doing here?' He is one of the Hums.'"

أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ مُحَمَّدِ بْنِ جُبَيْرِ بْنِ مُطْعِمٍ، عَنْ أَبِيهِ، قَالَ أَضْلَلْتُ بَعِيرًا لِي فَذَهَبْتُ أَطْلُبُهُ بِعَرَفَةَ يَوْمَ عَرَفَةَ فَرَأَيْتُ النَّبِيَّ صلى الله عليه وسلم وَاقِفًا فَقُلْتُ مَا شَأْنُ هَذَا إِنَّمَا هَذَا مِنَ الْحُمْسِ ‏.‏