Mahabharata 9.38.2

9.38.2

dattvā dānaṃ dvijātibhyo rajanīṃ tāmupoṣya ca |
pūjito munisaṃghaiśca prātarutthāya lāṅgalī || 2 ||

Vaishampayana said, "Having passed one night more, Rama, having the plough for his weapon, worshipped the dwellers of that tirtha and showed his regard for Mankanaka. Having given wealth unto the Brahmanas, and passed the night there, the hero having the plough for his weapon was worshipped by the Munis. Rising up in the morning, he took leave of all the ascetics, and having touched the sacred water, O Bharata, set out quickly for other tirthas. Baladeva then went to the tirtha known by the name of Usanas. It is also called Kapalamochana. Formerly, Rama (the son of Dasaratha) slew a Rakshasa and hurled his head to a great distance. That head, O king, fell upon the thigh of a great sage named Mahodara and struck to it. Bathing in this tirtha, the great Rishi became freed from the burthen. The high-souled Kavi (Sukra) had performed his ascetic penances there. It was there that the whole science of politics and morals (that goes by Sukra's name) appeared to him by inward light. While residing there, Sukra meditated upon the war of the Daityas and the Danavas (with the gods). Arrived at that foremost of tirthas, Baladeva, O king, duly made presents unto the high-souled Brahmanas.'