Skanda Purana 4.101.19

4.101.19

17 śrīśivasya bhālasthalato bhūmau nipatitātsvedabindorlohitāṅgasyotpattiḥ, śivaprasādāttasya lokādhipatyādikathanam, aṅgirasasya śivaprasādārthaṃ vārāṇasyāṃ tapaḥkaraṇam, śivasya varaprasādāllokapatitvadevagurutvalābhaḥ, mārtaṇḍātsaṃjñāpratikṛtau chāyāyāṃ śanaiścarotpattikathanam, tasya vārāṇasyāṃ tapaścaraṇāllokapālatvagrahamukhyatvalābhavarṇanaṃ ca................. 76 2

17 The birth of Lohitāṅga [Mars] from a drop of sweat that fell to the earth from the forehead of the glorious Śiva; narration of his lordship over a world and other [rewards] through Śiva's grace; Aṅgiras performing austerity in Vārāṇasī for the grace of Śiva; [his] attainment of the status of a world-guardian and the guru of the gods through the grace of Śiva's boon; narration of the birth of Śanaiścara from Mārtaṇḍa in Chāyā, the likeness of Saṃjñā; and description of his attainment of the status of a world-guardian and chief among the planets through performing austerity in Vārāṇasī: 76 2.