Where we can find the well known sō’ham specifically referred to Siva?
Which Tantra/Slokas or any related text repeat this celebrated mantra as a form of worship to Mahadev?
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(कुलार्णवतन्त्रम्)- देहो देवालयो देवि जीवो देवः सदाशिवः । त्यजेदज्ञाननिर्माल्य सोऽहम्भावेन पूजयेत् ॥
Meaning: Lord shiva says 'O devi Parvati' This body (देह) is itself the Devālay (देवालय)! It consists of a God called 'jivā' (जीव). Shstra(शास्त्र) calls this (सदाशिव) sadāshivā! It has been covered with lack of knowledge, the followers responsiblity is to remove this cover & worship it with 'sóhām bhāvā' through the medium of 'Ajapa-japa'.
Although not mantra, the 'sóhām' is associated with shiva here. 'Ajapa-japa' is the practice of japa without the mental effort normally needed to repeat the mantra.