Sahih Bukhari Volume 1, Book 12, Hadith Number 754

Narated By ‘Ikrima : I saw a person praying at Muqam-lbrahim (the place of Abraham by the Ka’ba) and he was saying Takbir on every bowing, rising, standing and sitting. I asked Ibn ‘Abbas (about this prayer). He admonished me saying: “Isn’t that the prayer of the Prophet?”