Vasudeva’s mind was full of anxiety because his wife was facing danger, but in order to please the cruel, shameless and sinful Kaṁsa, he externally smiled and spoke to him as follows.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रसन्नवदनाम्भोजो नृशंसं निरपत्रपम् । मनसा दूयमानेन विहसन्निदमब्रवीत्
prasannavadanāmbhojo nṛśaṃsaṃ nirapatrapam | manasā dūyamānena vihasannidamabravīt
SB 10.1.53