Markandeyapurana 16.48

16.48

pativratāyā māhātmyānnodgacchati divākaraḥ /
tasya cānudayāddhānirmartyānāṃ bhavatāṃ tathā //

Having heard the speech of these assembled gods who were fearful of the destruction of the sacrifices, the god Brahmā spoke, “Majesty is subdued by majesty indeed, and austerities also by austerities, O ye immortals! Hearken therefore to my advice. Through the might of the faithful wife the sun does not rise, and from his not rising loss befalls mortals and you. Hence do ye, through desire that the sun should rise, propitiate Atri’s faithful wife Anasūyā who is rich in austerities.”