With this attitude, Pṛṣadhra became a great saint, and when he entered the forest and saw a blazing forest fire, he took this opportunity to burn his body in the fire. Thus he achieved the transcendental, spiritual world.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एवंवृत्तो वनं गत्वा दृष्ट्वा दावाग्निमुत्थितम् । तेनोपयुक्तकरणो ब्रह्म प्राप परं मुनिः
evaṃvṛtto vanaṃ gatvā dṛṣṭvā dāvāgnimutthitam | tenopayuktakaraṇo brahma prāpa paraṃ muniḥ
SB 9.2.14