Skandapurana 14.37.12

14.37.12

tasthustatra sadā homaṃ kurvanto jāpyamuttamam ..
ekāhārā nirāhārā vāyubhakṣāstathā pare .. 12 ..

They remained there always offering oblations and performing supreme silent recitation: / some taking one meal, some taking no food, and others subsisting on wind;