Al-Baqarah · 2:158

158. The two mountains known as Ṣafā and Marwah, near to the Kaaba, are landmarks of the clear sacred law. Whoever goes to the Kaaba to perform the acts of Hajj or Umrah, there is no fault in them walking between the two mountains. By clarifying that there was no fault in this action, Allah was comforting those Muslims who avoided walking between the mountains because they feared it was an unacceptable action from the time of ignorance before Islam; but Allah made it clear that the walking between the mountains was an acceptable act of Hajj. Whoever sincerely does what is recommended of voluntary sacred acts, Allah acknowledges them and rewards them. He is aware of who does good and is worthy of being rewarded.