Skanda Purana 5.256.16

5.256.16

yathā pradīpe jvalite praṇaśyati mahattamaḥ ..
tathā hareḥ kathāyāṃ ca yāti pāpamanekadhā .. 15..
tasmātpārvati yatnena harau supte tapaḥ kuru ..
cāturmāsye'tha saṃprāpte praṇavena samanvitam .. 16 ..

Just as dense darkness is destroyed when a lamp is lit, / even so manifold sin vanishes during the narration of Hari. (15) / Therefore, O Pārvatī, diligently practice austerity while Hari is asleep, / when the Cāturmāsya has arrived, together with the Praṇava. (16)