Chapter 10 · The Divine Glories · Krishna said
Bhagavad Gita 10.28 — Vajra and Kamadhenu
आयुधानामहं वज्रं धेनूनामस्मि कामधुक्। प्रजनश्चास्मि कन्दर्पः सर्पाणामस्मि वासुकिः ॥
āyudhānāmahaṃ vajraṃ dhenūnāmasmi kāmadhuk | prajanaścāsmi kandarpaḥ sarpāṇāmasmi vāsukiḥ ||
Meaning
Among weapons I am the thunderbolt, and among cows I am Kamadhenu, the wish-fulfilling cow. Among causes of birth I am Kamdev, and among serpents I am Vasuki.