Is the "lam" in the Almighty's saying: (A mosque founded on piety) for inception or for an oath, like in the Almighty's saying: (By your life, indeed they are wandering blindly in their intoxication)?

The "Lam" in the verse: (لَمَسْجِدٌ) "lamasjidun" [for a mosque], is either the Lam of ابتداء (initiation) or the Lam of قَسَم (oath), both of which serve to emphasize and affirm the meaning of the sentence. Most exegetes have stated that it is the Lam of ابتداء, while some have said it is both the Lam of ابتداء and the Lam of qasam together. There is no evidence to favor one meaning over the other, and their meanings are close due to their convergence in emphasis and affirmation.