Abdur Rahman bin al-Qasim عبد الرحمن بن القاسم بن محمد بن أبي بكر · The Book on Hajj

"The Prophet started the Talbiyah after the Salat."

"The Prophet purchased his Hadi in Qudaid."

"A man asked the Messenger of Allah: 'I shaved before slaughtering.' So he said: 'Slaughter, and there is no harm.' Another man asked him: 'I performed the sacrifice before stoning.' He said: 'Stone, and there is no harm.'"

His father disliked making a condition during Hajj and he said: 'Is not the Sunnah of your Prophet enough for you?"