Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 7

Sanskrit:

कंसो बताद्याकृत मेऽत्यनुग्रहंद्रक्ष्येऽङ्‍‍‍‍‍घ्रिपद्मं प्रहितोऽमुना हरे: ।कृतावतारस्य दुरत्ययं तम:पूर्वेऽतरन् यन्नखमण्डलत्विषा ॥ ७ ॥

ITRANS:

kaṁso batādyākṛta me ’ty-anugrahaṁdrakṣye ’ṅghri-padmaṁ prahito ’munā hareḥkṛtāvatārasya duratyayaṁ tamaḥpūrve ’taran yan-nakha-maṇḍala-tviṣā

Translation:

Indeed, today King Kaṁsa has shown me extreme mercy by sending me to see the lotus feet of Lord Hari, who has now appeared in this world. Simply by the effulgence of His toenails, many souls in the past have transcended the insurmountable darkness of material existence and achieved liberation.

Purport:

Akrūra noted how ironic it was that the envious, demoniac Kaṁsa had given him an extraordinary blessing by sending him to see the Supreme Lord Kṛṣṇa.