Its origin: They want to extinguish, as mentioned in Surah At-Tawbah. It is as if this 'lam' was added with the verb of wanting to emphasize it, due to its meaning of wanting in your saying: I came to honor you, just as the 'lam' was added in: I have no father for you, to emphasize the meaning of addition in: I have no father for you. And extinguishing the light of Allah with their mouths: it mocks them in their desire to nullify Islam by saying about the Quran: This is magic. Their condition is likened to that of someone who blows into the sunlight with his mouth to extinguish it. And Allah will complete His light, meaning He will complete the truth and reach its ultimate goal. And it has been recited with addition.