Bhagavad Gita · 11.49

मा ते व्यथा मा च विमूढभावोदृष्ट्वा रूपं घोरमीदृङ्ममेदम्।व्यपेतभीः प्रीतमनाः पुनस्त्वंतदेव मे रूपमिदं प्रपश्य॥

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

Do not be disturbed or bewildered by seeing this terrible form of mine. Free from fear, with a pleased heart, behold once again my familiar form.

— Bhagavad Gita 11.49

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