Bhagavad Gita · 10.24

पुरोधसां च मुख्यं मां विद्धि पार्थ बृहस्पतिम्।सेनानीनामहं स्कन्दः सरसामस्मि सागरः॥

purodhasāṁ cha mukhyaṁ māṁ viddhi pārtha bṛihaspatim senānīnām ahaṁ skandaḥ sarasām asmi sāgaraḥ

Know me, O Arjuna, to be Brihaspati, the chief of priests. Among generals, I am Skanda (Kartikeya). Among water bodies, I am the ocean.

— Bhagavad Gita 10.24

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