Musnad Ahmad 27:1448

Mu'ammal narrated to us, Sufyan narrated to us, from Musa ibn 'Uqbah, from Salim, who said: When al-Bayda' was mentioned in the presence of Ibn 'Umar, he would curse it, or he almost cursed it, and he would say: "The Messenger of Allah (peace and blessings of Allah be upon him) only entered into ihram from Dhu al-Hulayfah."