O gentle one, does Sāmba fare well? He exactly resembles the son of the Personality of Godhead. In a previous birth he was born as Kārttikeya in the womb of the wife of Lord Śiva, and now he has been born in the womb of Jāmbavatī, the most enriched wife of Kṛṣṇa.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कच्चिद्धरेः सौम्य सुतः सदृक्ष आस्तेऽग्रणी रथिनां साधु साम्बः । असूत यं जाम्बवती व्रताढ्या देवं गुहं योंऽबिकया धृतोऽग्रे
kacciddhareḥ saumya sutaḥ sadṛkṣa āste'graṇī rathināṃ sādhu sāmbaḥ | asūta yaṃ jāmbavatī vratāḍhyā devaṃ guhaṃ yoṃ'bikayā dhṛto'gre
SB 3.1.30