Wanting to pacify Kaṁsa, who was so cruel and envious that he was shamelessly ready to kill his sister, the great soul Vasudeva, who was to be the father of Kṛṣṇa, spoke to him in the following words.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तं जुगुप्सितकर्माणं नृशंसं निरपत्रपम् । वसुदेवो महाभाग उवाच परिसान्त्वयन्
taṃ jugupsitakarmāṇaṃ nṛśaṃsaṃ nirapatrapam | vasudevo mahābhāga uvāca parisāntvayan
SB 10.1.36