1st person singular future indicative of bhāsati, with iti quotative particle
Analysis. bhāsissāmi + iti: 'he/she will speak' + quotative particle iti ('thus', 'saying'), forming an indirect or reported speech construction; the whole phrase introduces what is about to be spoken or understood.
Etymology. bhāsati < PIE *bhās- 'to shine, shine forth'; cognates include Sanskrit bhāsate 'shines', Latin fax 'torch', English blazon. The root's primary sense 'shine' shifts to 'speak' via the metaphor of voice as radiance — speaking as something bright that issues forth.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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