On that very spot, the fiercely dangerous Rākṣasī took Kṛṣṇa on her lap and pushed her breast into His mouth. The nipple of her breast was smeared with a dangerous, immediately effective poison, but the Supreme Personality of Godhead, Kṛṣṇa, becoming very angry at her, took hold of her breast, squeezed it very hard with both hands, and sucked out both the poison and her life.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तस्मिन् स्तनं दुर्जरवीर्यमुल्बणं घोराङ्कमादाय शिशोर्ददावथ । गाढं कराभ्यां भगवान् प्रपीड्य तत् प्राणैः समं रोषसमन्वितोऽपिबत्
tasmin stanaṃ durjaravīryamulbaṇaṃ ghorāṅkamādāya śiśordadāvatha | gāḍhaṃ karābhyāṃ bhagavān prapīḍya tat prāṇaiḥ samaṃ roṣasamanvito'pibat
SB 10.6.10