This was guarded by snakes, the favourite drink of Kubera, as it was drinking which even an earthy man gets immortality.
आशीविषै रक्ष्यमाणं कुबैरदयितं भृशम्। यत् प्राप्य पुरुषो मर्योऽप्यमरत्वं नियच्छति॥