Skandapurana 5.251.42

5.251.42

pravarttaṃte hi māseṣu caturṣu ca na saṃśayaḥ ..
cāturmāsye devapatnyaḥ sarvā vallīsamāśri tāḥ .. 42 ..

become active during these four months; of this there is no doubt. / During the Cāturmāsya, all the wives of the gods reside in climbing vines;