Mudgalapurana 5.16.44

5.16.44

tato'tiduḥkhitaḥ śeṣaḥ sasmāra gaṇanāyakam |
nirvighnārthaṃ prajānātha putrabhāvārthamādarāt ||

Then Śeṣa, deeply grieved, remembered the leader of the Gaṇas, / with reverence, O lord of creatures, so that obstacles would be removed and [the god] would become his son.