إِنَّ الصَّفَا وَالْمَرْوَةَ مِنْ شَعَائِرِ اللَّهِ... لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ، لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ أَنْجَزَ وَعْدَهُ وَنَصَرَ عَبْدَهُ وَهَزَمَ الْأَحْزَابَ وَحْدَهُ
Transliteration
Innas-Safa wal-Marwata min sha'a'irillah... La ilaha illallahu wahdahu la sharika lahu lahul-mulku wa lahul-hamdu wa huwa 'ala kulli shay'in qadirun, la ilaha illallahu wahdahu anjaza wa'dahu wa nasara 'abdahu wa hazamal-ahzaba wahdah
English meaning
Indeed, Safa and Marwah are among the signs of Allah. None has the right to be worshipped except Allah alone, without partner. His is the sovereignty, His is the praise, and He is over all things omnipotent. None has the right to be worshipped except Allah alone. He fulfilled His promise, aided His servant, and defeated the confederates alone.
When is it recited?
Recited while facing the Ka'bah upon reaching the top of Safa and Marwah.
Source
Muslim, Hajj 147, 1218; Al-Baqarah 2:158