Yāska's Nirukta 46.26

Ṛjvarthā (Niruktavṛtti) 46.26

dūranāmānyuttarāṇi pañca |
āha - "navaṃ kasmāt"? ucyate, taddhi sadya eva kutaścit "ānītaṃ bhavati" kṣiprotpannaṃ nūtamamityevamādi |