بَسْمَلَ
Translation: He recited “Bismillāh al-Raḥmān al-Raḥīm.”
This illustrates abbreviated verbal expression: a familiar multiword phrase is represented by a conventional short verb.
Full phraseCompact verb
بِسْمِ اللَّهِ الرَّحْمٰنِ الرَّحِيمِبَسْمَلَ
This is not simply deleting a few letters from any arbitrary word. It is a lexicalized way of naming the recitation of a known expression.