Within the womb of Devakī is My partial plenary expansion known as Saṅkarṣaṇa or Śeṣa. Without difficulty, transfer Him into the womb of Rohiṇī.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
देवक्या जठरे गर्भं शेषाख्यं धाम मामकम् । तत्सन्निकृष्य रोहिण्या उदरे सन्निवेशय
devakyā jaṭhare garbhaṃ śeṣākhyaṃ dhāma māmakam | tatsannikṛṣya rohiṇyā udare sanniveśaya
SB 10.2.8