Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 53: Śabalā Feeds King Viśvāmitra and his Entourage
Text 1.53.18

हैरण्यकक्ष्याग्रैवेयान्सुवर्णाङ्कुशभूषितान्।
ददामि ते कुञ्जराणां ते सहस्राणि चतुर्दश॥

hairaṇya-kakṣyā-graiveyān suvarṇāṅkuśa-bhūṣitān
dadāmi
te kuñjarāṇāṁ te sahasrāṇi caturdaśa

Hairaṇya-kakṣyā-graiveyān indicates that the elephants had chains binding their waists and necks all in gold.[2]

kakṣyā-prakoṣṭhe harmyādeḥ kāñcyāṁ madhyebha-bandhane (Amara)