In the book- Amulets and Ruqyas in Islam: https://ia601206.us.archive.org/2/i...nd Ruqyas in Islam by Fazal ullah chishti.pdf This is briefly touched upon
ب-2 س-60 م-40 بسم=102 ا-1 ل-30 ل-30 ه-6 اللہ=66 ا-1 ل-30 ر-200 ح-8 م-40 ن-50 الرحمن=329 ا-1 ل-30 ر-200 ح-8 ی-10 م-40 الرحیم=289 102+66+329+289=786 (According to Abjad-e-Qamari.)
Came across this on a Maliki Sunni site when looking for something else for the in sha Allah thread https://www.souhnoun.com/أدعية-و-أذكار/فوائد-البسملة/ Some juhhal from the subcontinent say that 786 is not the numerical summation of the Basmala as per abjad numerical representations, and they insist it is some conspiracy and 786 is actually the numerical representation for some hindu chant, lol.