Matsyapurana 23.15

23.15

viṃśatiṃ ca tathā sapta dakṣaḥ prācetaso dadau
rūpalāvaṇyasaṃyuktās tasmai kanyāḥ suvarcasaḥ //

In the days gone by Dakṣa Prajâpati son of Prachetas gave his twenty seven beautiful daughters to the moon. The moon to please Lord Viṣṇu practised austerities for a considerable length of time. The Lord became pleased with his devotion and directed Him to ask for a boon. The moon wished, that he might conquer the realm of Indra, the Devas might go to His region and officiate as Brâhmaṇ as in His Râjasûya sacrifice, and Lord Śiva might protect it (sacrifice,) with his trident standing at his door.—15-19.