Ruling on Salah offered without saying Du`a'-ul-Istiftah

Q 5: A woman asks about the ruling on offering Salah (Prayer) and forgetting Du‘a’-ul-Istiftah (opening supplication when starting the Prayer). Should she repeat the Salah or is Salah valid without it?

A: Du‘a’-ul-Istiftah is a Sunnah (supererogatory act of worship following the example of the Prophet), so the Salah of whoever leaves it out is valid; since they do not abandon a Rukn (Pillar) or a Wajib (obligatory act).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.