śrī mahānyāsam - 7.4. apratirathaṃ

The Apratiratha Suktam is a powerful Vedic hymn extracted from the Taittiriya Samhita of the Krishna Yajurveda. Dedicated to Lord Indra, the king of devas and the embodiment of invincible divine power, it serves as a prayer for victory and protection in battle. Often recited within the context of Mahanayasa, this hymn invokes the fierce and unconquerable nature of Indra to grant the devotee courage, strength, and success in overcoming external obstacles and inner weaknesses. Its recitation is traditionally believed to destroy negativity, instill warrior-like discipline, and ensure triumph over all adversities.