Thereafter, all the watchmen very quickly approached King Kaṁsa, the ruler of the Bhoja dynasty, and submitted the news of the birth of Devakī’s child. Kaṁsa, who had awaited this news very anxiously, immediately took action.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ते तु तूर्णमुपव्रज्य देवक्या गर्भजन्म तत् । आचख्युर्भोजराजाय यदुद्विग्नः प्रतीक्षते
te tu tūrṇamupavrajya devakyā garbhajanma tat | ācakhyurbhojarājāya yadudvignaḥ pratīkṣate
SB 10.4.2