मा ते व्यथा मा च विमूढभावो दृष्ट्वा रूपं घोरमीदृङ्ममेदम्। व्यपेतभीः प्रीतमनाः पुनस्त्वं तदेव मे रूपमिदं प्रपश्य ॥

mā te vyathā mā cha vimūḍha-bhāvo dṛiṣhṭvā rūpaṁ ghoram īdṛiṅ mamedam vyapeta-bhīḥ prīta-manāḥ punas tvaṁ tad eva me rūpam idaṁ prapaśhya

Be not bewildered, be thou not afraid, Because thou hast beheld this awful Form; Cast fear away, and let thy heart rejoice; Behold again Mine own familiar shape.

In plain words: Krishna tells Arjuna not to be confused or afraid after seeing the terrifying form. He asks him to let go of fear, be glad, and look again at Krishna's familiar shape.