The recommended Surah to read on Friday is Surah Al-Kahf (The Cave), which is the 18th Surah of the Quran. It is highly virtuous to recite this Surah on Friday, as the Prophet Muhammad (peace be upon him) advised that whoever recites Surah Al-Kahf on Friday will have a light shining upon them from one Friday to the next. This Surah contains powerful stories with lessons about faith, perseverance, and divine protection, including the story of the People of the Cave. It is recommended to recite Surah Al-Kahf anytime from sunset on Thursday (beginning of the night of Friday) until sunset on Friday.