Ruci, who was very powerful in his brahminical qualifications and was appointed one of the progenitors of the living entities, begot one son and one daughter by his wife, Ākūti.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रजापतिः स भगवान् रुचिस्तस्यामजीजनत् । मिथुनं ब्रह्मवर्चस्वी परमेण समाधिना
prajāpatiḥ sa bhagavān rucistasyāmajījanat | mithunaṃ brahmavarcasvī parameṇa samādhinā
SB 4.1.3