Bhagavatapurana 9.20.35

9.20.35

tasyaivaṃ vitathe vaṃśe tadarthaṃ yajataḥ sutam /
marutstomena maruto bharadvājamupādaduḥ //

35. When his line was thus cut off and he performed a sacri-

fice for the sake of children by means of Marutstoma, (a particular form of sacrifice) Maruts granted him Bharadvaja as his son.