Verse
न वेदयज्ञाध्ययनैर्न दानैर्-न च क्रियाभिर्न तपोभिरुग्रैः ।एवं रूपः शक्य अहं नृलोकेद्रष्टुं त्वदन्येन कुरुप्रवीर ॥
na vedayajñādhyayanairna dānair-na ca kriyābhirna tapobhirugraiḥevaṃ rūpaḥ śakya ahaṃ nṛlokedraṣṭuṃ tvadanyena kurupravīra
Neither by the study of Vedas and sacrifices, nor by gifts or ceremonial rites or severe austerities, this form of mine can be seen by any other than thyself, O foremost of Kurus.
Gītā 11·48