The authentically reported narrations on Al-Salat-ul-Ibrahimiyyah (the second part of the Tashahhud) do not include
the word "master". Hence it is not permissible to recite it in Salah (Prayer), since acts of worship are Tawqifiy (bound by a religious text and not subject to personal opinion) matters. If the book is to be printed and distributed, the word "master" must first be deleted from Al-Salat-ul-Ibrahimiyyah. This way, we will be acting upon the authentically reported narrations from the Prophet (peace be upon him).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.