Vasudeva agreed and took his child back home, but because Kaṁsa had no character and no self-control, Vasudeva knew that he could not rely on Kaṁsa’s word.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तथेति सुतमादाय ययावानकदुन्दुभिः । नाभ्यनन्दत तद्वाक्यमसतोऽविजितात्मनः
tatheti sutamādāya yayāvānakadundubhiḥ | nābhyanandata tadvākyamasato'vijitātmanaḥ
SB 10.1.61