Skandapurana 5.270.28

5.270.28

tatra kalpasahasrāṃte sa prokto brahmaṇā svayam..
iṃdradyumna dharāṃ gaccha na sthātavyaṃ tvayā'dhunā..28..

There, at the end of a thousand kalpas, he was told by Brahmā himself: / “Indradyumna, go to earth; you may not remain here any longer.”