सुरुङ्गायुक्ते वा कूपे नागमनियतशिरस्कं हिरण्योपहारेण दर्शयेत् ॥ कZ_०५.२.४२ ॥
suruṅgāyukte vā kūpe nāgam aniyataśiraskaṃ hiraṇyopahāreṇa darśayet ।
あるいは、抜け道を備えた井戸で、頭が不規則に現れる「ナーガ」を、金の供物と結びつけて見せるべきである。
A tunnel-linked well allows an agent/animal/effigy to appear and disappear, simulating a nāga’s unpredictable emergence.
The appearance is conditioned on ‘hiraṇya-upahāra’—the act of offering gold.