Ramayana
तस्मिन्प्रहर्तुकामे तु यमे दण्डेन रावणम् । यमं पितामहः साक्षाद्दर्शयित्वेदमब्रवीत् ॥ 7-22-38 ॥
But as Yama was on the point of striking Ravana with his rod, the Grandsire (Brahma) showed himself before Yama in person and spoke these words.
english translation