Skandapurana 5.87.14

5.87.14

saumyarkṣe somavāreṇa saumye māsi ca saṃsthite ..
tithau ca somadevatye prāpte somagrahe tathā ..
sakāraiḥ paṃcabhiryukte kāle somasya maṃdiram .. 14 ..

“In a lunar constellation, on a Monday, when the month is Saumya (Mārgaśīrṣa), / on a lunar day dedicated to Soma, and likewise when a lunar eclipse has occurred, / at a time possessed of the five ‘sa’s, a temple of Soma—