Devibhagavatapurana 11.23.55

11.23.55

etadrudrāstathādityā vasavaśca caranti hi |
sarve kuśalino devā marutaśca bhuvā saha ||

These abovementioned vratas are observed by the Rudras, Âdityas, Vâsus, and Maruts; and they are enjoying thereby their full safety.
Each of the above vratas purifies the seven Dhâtus of the body in seven nights simply! First skin, then blood, then flesh, bones, sinews, marrows and semen are purified. There is no doubt in this. Thus purifying the Âtman by the above vratas, one is to do religious actions. The work done by such a purified man is sure to be met with success. First control the senses, be pure and do good actions. Then all your desires will be undoubtedly fructified. Fast for three nights, without doing any actions and see the result. (You will not do anything and you want self control! Is this a child’s play?) Perform for three days the nocturnal vratas. Then proceed with your desired duties. If one works according to these methods, one gets the fruits of Puras’charanam. O Nârada! By the Puras’charanam of S’rî Gâyatrî Devî all desires are fulfilled and all sins are destroyed. Before doing Puras’charanam purify your body by performing the above vratas. Then you will get all your desires completely fulfilled. O Nârada! Thus I have spoken to you of the secret rules of Puras’charanam. Never disclose this to any other body. For it is recognised equivalent to the Vedas.
Here ends the Twenty-third Chapter of the Eleventh Book on the Tapta Krichchhra vrata and others in the Mahâ Purânam S’rî Mad Devî Bhâgavatam of 18,000 verses by Maharsi Veda Vyâsa.