Mudgalapurana 2.6.5

2.6.5

kanyāstisraḥ samākhyātā manostasya mahātmanaḥ |
prasūtiṃ sa dadau tubhyamākūtiṃ rucaye tathā ||

Three daughters of that great-souled Manu are declared. / He gave Prasūti to you, and likewise Ākūti to Ruci;