From Sahih Bukhari (Hadith 787):
Narrated `Ikrima:I saw a person praying at Muqam-Ibrahim (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?
Reference: Bukhari 787