After hearing the words of the goddess Durgā, Kaṁsa was struck with wonder. Thus he approached his sister Devakī and brother-in-law Vasudeva, released them immediately from their shackles, and very humbly spoke as follows.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तयाभिहितमाकर्ण्य कंसः परमविस्मितः । देवकीं वसुदेवं च विमुच्य प्रश्रितोऽब्रवीत्
tayābhihitamākarṇya kaṃsaḥ paramavismitaḥ | devakīṃ vasudevaṃ ca vimucya praśrito'bravīt
SB 10.4.14