Shiva Purana
गौतमोपि ऋषीन्दृष्ट्वा तदा दुर्भिक्षपीडितान् ॥ तपश्चकार सुमहद्वरुणस्य महात्मनः ॥ २५ ॥
On seeing the sages distressed by the famine, Gautama performed a great penance with god Varuṇa as the object of his worship.
english translation
gautamopi RSIndRSTvA tadA durbhikSapIDitAn ॥ tapazcakAra sumahadvaruNasya mahAtmanaH ॥ 25 ॥
hk transliteration by Sanscript