Skanda Purana — Nagara Khanda, Shloka 34
ततः सर्वं वृथा तस्य भविष्यति न संशयः । विशुद्धिरहितं यस्तु नागरं भोजयिष्यति
tataḥ sarvaṃ vṛthā tasya bhaviṣyati na saṃśayaḥ | viśuddhirahitaṃ yastu nāgaraṃ bhojayiṣyati
ดังนั้นทุกสิ่งย่อมเป็นหมันแก่ผู้นั้น—ไม่ต้องสงสัย และผู้ใดเลี้ยงภัตตาหารแก่นาคระที่ปราศจากความบริสุทธิ์…
Unspecified in the snippet (continuation of the prescriptive teaching)
Listener: Dvijas/householders
Scene: A śrāddha setting where offerings and feast are prepared; a recipient marked by signs of aśauca/impurity approaches, and the ritual’s radiance dims—symbolizing vṛthātva (loss of fruit).
FAQs
Merit depends on purity and correct recipients; ritual generosity without purity loses its intended spiritual fruit.
No specific tīrtha is named here; the focus is on dharmic procedure within a tīrtha-māhātmya setting.
Do not offer ritual meals (especially in śrāddha contexts) to an unpurified recipient; otherwise the rite is rendered vain.