Canto 2 -
Ayodhyā-kāṇḍa
Chapter 110: Vasiṣṭha Requests Rāma to Accept the Throne
Text 2.110.6

विवस्वान्कश्यपाज्जज्ञे मनुर्वैवस्वतः सुतः।
स तु प्रजापतिः पूर्वमिक्ष्वाकुस्तु मनोः सुतः॥

vivasvān kaśyapāj jajñe manur vaivasvataḥ sutaḥ
sa tu prajāpatiḥ pūrvam ikṣvākus tu manoḥ sutaḥ

vivasvān = Vivasvān; kaśyapāt = of Kaśyapa; jajñe = was born; manuḥ = Manu; vaivasvataḥ = of Vivasvān; sutaḥ = was the son;  saḥ tu = he; prajāpatiḥ = a prajāpati; pūrvam = was formerly; ikṣvākuḥ tu = Ikṣvāku; manoḥ = of Manu; sutaḥ = was the son.

“Vivasvān was born of Kaśyapa. Manu was the son of Vivasvān. He was formerly a Prajāpati. Ikṣvāku was the son of Manu.