Śrāddha-kalpa: Amarakantaka–Tīrtha-Māhātmya and Akṣaya Pitṛ-Tarpaṇa
दृष्टवान्स्वर्गसोपानं भगवानङ्गिराः पुरा / अग्निहोत्रे महातेजाः प्रस्तारार्थं कुशोत्तमान्
dṛṣṭavānsvargasopānaṃ bhagavānaṅgirāḥ purā / agnihotre mahātejāḥ prastārārthaṃ kuśottamān
In ancient times, the venerable Aṅgiras beheld the stairway to heaven. Radiant with great splendor, he took the finest kuśa-grass for the prastara in the Agnihotra rite.