Bhūridattajātaka

Suttapiṭaka · Khuddakanikāya · Jātaka (2) · Vol. 28 · Section 748

[748] There may be venom in the house snake (silutta), in the water snake (duḍḍubha), and in the green snake (silābhu); but of the red-headed nāga no venom exists at all.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.