Śrīmad-Bhāgavatam · Text 10.36.19
Who is speaking and story frame
निवारितो नारदेन तत्सुतौ मृत्युमात्मन: ।
ज्ञात्वा लोहमयै: पाशैर्बबन्ध सह भार्यया ॥ १९ ॥
nivārito nāradena
tat-sutau mṛtyum ātmanaḥ
jñātvā loha-mayaiḥ pāśair
babandha saha bhāryayā
But Nārada restrained Kaṁsa by reminding him that it was the two sons of Vasudeva who would cause his death. Kaṁsa then had Vasudeva and his wife shackled in iron chains.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.