purodhasam ca mukhyam mam
viddhi partha brhaspatim
senaninam aham skandah
sarasam asmi sagarah

Translation
Of priests, O Arjuna, know Me to be the chief, Brhaspati. Of generals I am Kartikeya, and of bodies of water I am the ocean.

Purport
Indra is the chief demigod of the heavenly planets and is known as the king of the heavens. The planet on which he reigns is called Indraloka. Brhaspati is Indra’s priest, and since Indra is the chief of all kings, Brhaspati is the chief of all priests. And as Indra is the chief of all kings, similarly Skanda, or Kärtikeya, the son of Parvati and Lord Siva, is the chief of all military commanders. And of all bodies of water, the ocean is the greatest. These representations of Krsna only give hints of His greatness.

Srila A.C. Bhaktivedanta Swami Prabhupada
Bhagavad-gita 10.24