Kamsa begged, "My dear sister and brother-in-law (Devaki and Vasudeva), please be merciful to such a poor-hearted person as me, since both of you are saintly persons. Please excuse my atrocities" - SB 10.4.23

Expressions researched:
"Kaṁsa begged" |"My dear sister and brother-in-law, please be merciful to such a poor-hearted person as me, since both of you are saintly persons. Please excuse my atrocities"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Kaṁsa begged, "My dear sister and brother-in-law, please be merciful to such a poor-hearted person as me, since both of you are saintly persons. Please excuse my atrocities.".

SB 10.4.23, Translation and Purport

Kaṁsa begged, "My dear sister and brother-in-law, please be merciful to such a poor-hearted person as me, since both of you are saintly persons. Please excuse my atrocities." Having said this, Kaṁsa fell at the feet of Vasudeva and Devakī, his eyes full of tears of regret.

Although Kaṁsa had spoken very nicely on the subject of real knowledge, his past deeds were abominable and atrocious, and therefore he further begged forgiveness from his sister and brother-in-law by falling at their feet and admitting that he was a most sinful person.