पश्यादित्यान्वसून्रुद्रानश्िवनौ मरुतस्तथा। बहून्यदृष्टपूर्वाणि पश्याऽश्चर्याणि भारत ॥

paśhyādityān vasūn rudrān aśhvinau marutas tathā bahūny adṛiṣhṭa-pūrvāṇi paśhyāśhcharyāṇi bhārata

Behold the Âdityas, the Vasus, the Rudras, the two Ashvins and also the Maruts; behold many marvels never seen ere this, O Bhârata.

In plain words: Krishna tells Arjuna to see many groups of gods in him, such as the Adityas, Vasus, Rudras, the twin Ashvins and the storm gods called Maruts. He will see many wonders no one has seen before.