The first instance that already came up in the discussion between Bhante Dhammarakkhita and me is about Pc8 (bu) / Pc104 (bi), not disclosing one’s superhuman state to laypeople. Anuruddha does exactly that in MN 127:
Anuruddha gives a talk about various devas in the presence of a householder. Then another bhikkhu asks about his personal experience and Anuruddha openly confirms that he is able to associate with them.
When this was said, the venerable Abhiya Kaccāna said to the venerable
Anuruddha: “Good, venerable Anuruddha. The venerable Anuruddha does not
say: ‘Thus have I heard’ or ‘It should be thus.’ Rather, the venerable Anuruddha
says: ‘These gods are thus and those gods are such.’ It occurs to me, venerable
sir, that the venerable Anuruddha certainly has previously associated with
those deities and talked with them and held conversations with them.”
“Certainly, friend Kaccāna, your words are offensive and discourteous, but still I
will answer you. Over a long time I have previously associated with those
deities and talked with them and held conversations with them.”
When this was said, the venerable Abhiya Kaccāna said to the carpenter
Pañcakanga: “It is a gain for you, householder, it is a great gain for you that
you have abandoned your state of doubt and have had the opportunity to hear
this discourse on the Dhamma.”