And as one who invites to Allah [Islamic Monotheism, i.e. to worship none but Allah (Alone)] by His Leave, and as a lamp spreading light (through your instructions from the Quran and the Sunnah the legal ways of the Prophet SAW).
かれの許しで（人びとを）アッラーに招く者，光明を行き渡らせる燈として（遣わした）のである。