Hadith 8:3044
Abu Bakr narrated to us, he said: Ibn Numayr narrated to us, from Ubayd Allah, from Nafi’, from Ibn Umar, that when he would ascend upon al-Safa, he would face the House (the Kaaba) and say "Allahu Akbar" (God is the Greatest) three times. And he would say: "There is no god but Allah alone, He has no partner. To Him belongs the dominion, and to Him belongs the praise, and He is capable of all things." He would raise his voice with that, then he would supplicate for a long time.
حدثنا أبو بكر قال نا بن نمير عن عبيد الله عن نافع عن بن عمر أنه كان إذا صعد على الصفا استقبل البيت وكبر ثلاثا وقال لا إله إلا الله وحده لا شريك له له الملك وله الحمد وهو على كل شيء قدير يرفع بها صوته ثم يدعو طويلا