Vishnupurana 5.4.15

5.4.15

kaṃsa uvāca
yuvayorghātitā garbhā vṛthaivaite mayādhunā /
kopyanya eva nāśāya mama garbhaḥsamudyataḥ //

Having issued these commands, Kansa retired into his palace, and liberated Vasudeva and Devakí from their captivity. "It is in vain,"

said he to them, "that I have slain all your children, since after all he who is destined to kill me has escaped. It is of no use to regret the past. The children you may hereafter have may enjoy life unto its natural close; no one shall cut it short." Having thus conciliated them, Kansa, alarmed for himself, withdrew into the interior apartments of his palace.