It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) stood on Safa, he would say Allahu Akbar three times and say: "There is no true deity except Allah, alone, He has no partner, His is the dominion, and to Him belongs all praise, and He has power over all things." He would say this three times and make supplication, then upon reaching Marwah, he would do the same.