Devibhagavatapurana 10.13.71

10.13.71

ityādiśya guruṃ sarve jagmurjāmbūnadeśvarīm |
sāsmāndaityabhayatrastān pālayiṣyati śobhanā ||

Thus commanding Brihaspati and thinking that the beautiful Protectress of Jâmbû Nada would protect them the Devas all started to worship Her and, going there, began the Devî Yajña and with great devotion muttered the Mâyâ Vîja and practised asceticism. On the other hand, Brihaspati went ere long in the garb of a Muni to the Daitya Aruna. The king of the Daityas then asked him:-- “O Best of Munis! Whence and why have you come here. Say, O Muni! Where have you come? I am not one of your party. Rather I am your enemy.” Hearing the above words, Brihaspati said:-- When you are worshipping incessantly the Devî whom we too worship, then say how you are not a one on our side! O Saint! The vicious Daitya, hearing the above words and deluded by the Mâyâ of the Devas, forsook the Gâyatrî Mantra out of vanity and therefore he became weak, bereft of the Holy Fire.