Sahih (Sahih al-Bukhari)
حَدَّثَنَا عَمْرُو بْنُ عَوْنٍ، قَالَ حَدَّثَنَا هُشَيْمٌ، عَنْ أَبِي بِشْرٍ، عَنْ عِكْرِمَةَ، قَالَ رَأَيْتُ رَجُلاً عِنْدَ الْمَقَامِ يُكَبِّرُ فِي كُلِّ خَفْضٍ وَرَفْعٍ وَإِذَا قَامَ وَإِذَا وَضَعَ، فَأَخْبَرْتُ ابْنَ عَبَّاسٍ ـ رضى الله عنه ـ قَالَ أَوَلَيْسَ تِلْكَ صَلاَةَ النَّبِيِّ صلى الله عليه وسلم لاَ أُمَّ لَكَ.
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?