पश्यामि देवांस्तव देव देहे सर्वांस्तथा भूतविशेषसङ्घान्। ब्रह्माणमीशं कमलासनस्थ मृषींश्च सर्वानुरगांश्च दिव्यान् ॥

paśhyāmi devāns tava deva dehe sarvāns tathā bhūta-viśheṣha-saṅghān brahmāṇam īśhaṁ kamalāsana-stham ṛiṣhīnśh cha sarvān uragānśh cha divyān

Within Thy Form, O God, the Gods I see, All grades of beings with distinctive marks; Brahma, the Lord, upon His lotus-throne, The Rishis all, and Serpents, the Divine.

In plain words: Arjuna says he sees all the gods inside Krishna's form, along with every kind of living being. He sees Brahma, the creator god, sitting on his lotus seat, all the great sages (Rishis), and the divine serpents.