The Prophet ﷺ performed Hajj on its own.
حدثنا إسحاق بن عيسى قال حدثني المنكدر بن محمد عن ربيعة بن أبي عبد الرحمن عن القاسم بن محمد
أن النبي ﷺ أفرد الحج
No references are available.
Its isnad is sahih. Rabia bin Abu Abdul-Rahman is Rabia al-Ray, and he is trustworthy and a jurist, his hadith is found in the collections of the group, and the hadith has already appeared at 24610.