Bhagavatapurana 4.6.39

4.6.39

taṃ brahma-nirvāṇa-samādhim āśritaṃ vyupāśritaṃ giriśaṃ yoga-kakṣām /
sa-loka-pālā munayo manūnām ādyaṃ manuṃ prāñjalayaḥ praṇemuḥ //

39. The sages as well as the protectors of the world folded their hands and prostrated themselves before Śiva, the Lord of

the mountain, who was engaged in meditation to realise the bliss of being one with Brahman (being one with the blissful Brahman), who wore a special Yoga-Kakshā or Yoga-strap to secure the position of the left knee and who is the foremost Manu among the Manus.