Charak Samhita
मयूखैर्जगतः स्नेहं ग्रीष्मे पेपीयते रविः। स्वादु शीतं द्रवं स्निग्धमन्नपानं तदा हितम् ॥२७॥
॥ Diet and lifestyle guidelines in grishma ritu (summer season)॥ Effect of excess Sun-heat in summer: In grishma ritu (summer season), the Sun , by its rays, excessively dries up the environment. So, in this season, food and drinks having sweet, cold, liquid and unctuous qualities are considered wholesome.
english translation
mayUkhairjagataH snehaM grISme pepIyate raviH। svAdu zItaM dravaM snigdhamannapAnaM tadA hitam ॥27॥
hk transliteration by Sanscript