Matsya Purana 193.26

193.26

āścaryaṃ sumahajjātamumāyāḥ śaṅkarasya ca.
gaurī papraccha deveśaṃ ko'yamevantu saṃsthitā(taḥ) .. 193.25

One who offers libations to the manes there gets all the benefits of having performed the Aśwamedha sacrifice. The sage Bhṛigu practised austerities to the west of Daśaśwamedha for a thousand Divine years He was covered with anthills and nests of birds which amazed the Lord Śiva and His consort Parvatî Pârvatî asked the Lord as to who he was.—23-25