Shiva Purana
पत्नी या यादवी तस्य सगर्भा पृष्ठतो गता ॥ सपत्न्या च गरस्तस्यै दत्तः पूर्वं सुतेर्ष्यया ॥ ३३ ॥
One of his wives belonging to the house of Yadu followed him in pregnancy. Due to jealousy as a result of her expected son before her, the co-wife administered poison to her.
english translation
patnI yA yAdavI tasya sagarbhA pRSThato gatA ॥ sapatnyA ca garastasyai dattaH pUrvaM suterSyayA ॥ 33 ॥
hk transliteration by Sanscript