Skandapurana 16.207.12

16.207.12

ṣaṇmāsamayane bhuṃkte trīnmāsānviṣuve smṛtam ..
varṣairdvādaśabhiścaiva yatpuṇyaṃ samupārjitam ..
tatsarvaṃ vilayaṃ yāti bhuktvā sūryendusaṃplave .. 12 ..

If he eats [another's food] at the solstice, [it consumes the merit of] six months; at the equinox, it is taught to be three months. / Whatever merit was acquired over twelve years, / All that is lost by eating during a solar or lunar eclipse.