Bhagavad Gita · 10.25

महर्षीणां भृगुरहं गिरामस्म्येकमक्षरम्।यज्ञानां जपयज्ञोऽस्मि स्थावराणां हिमालयः॥

maharṣhīṇāṁ bhṛigur ahaṁ girām asmy ekam akṣharam yajñānāṁ japa-yajño 'smi sthāvarāṇāṁ himālayaḥ

Among the great sages, I am Bhrigu. Among words, I am the single syllable Om. Among sacrifices, I am the sacrifice of chanting (japa). Among immovable things, I am the Himalayas.

— Bhagavad Gita 10.25

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)