Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 23
Sanskrit:
इति घोरतमाद् भावात् सन्निवृत्त: स्वयं प्रभु: । आस्ते प्रतीक्षंस्तज्जन्म हरेर्वैरानुबन्धकृत् ॥ २३ ॥
ITRANS:
iti ghoratamād bhāvātsannivṛttaḥ svayaṁ prabhuḥāste pratīkṣaṁs taj-janmaharer vairānubandha-kṛt
Translation:
Śukadeva Gosvāmī said: Deliberating in this way, Kaṁsa, although determined to continue in enmity toward the Supreme Personality of Godhead, refrained from the vicious killing of his sister. He decided to wait until the Lord was born and then do what was needed.