Puthujjana wrote:
As monastic is not allow to reveal their attainment to a lay puthujjana.
pācittiya 8:
“yo pana bhikkhu anupasampannassa uttarimanussadhammaṃ āroceyya, bhūtasmiṃ pācittiyaṃ.”
One of the definition of uttarimanussadhammaṃ – the realization of a [supermundane] fruit. From Ven Analayo: https://1drv.ms/b/s!Aur-YjWuHG2AgZkG8P_R-fMMs9Il4A
With Metta