Twenty-seven catur-yugas have already passed. Those upon whom you may have decided are now gone, and so are their sons, grandsons and other descendants. You cannot even hear about their names.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अहो राजन् निरुद्धास्ते कालेन हृदि ये कृताः । तत्पुत्रपौत्रनप्तॄणां गोत्राणि च न शृण्महे
aho rājan niruddhāste kālena hṛdi ye kṛtāḥ | tatputrapautranaptṝṇāṃ gotrāṇi ca na śṛṇmahe
SB 9.3.32