Shiva Purana
नमस्कारं च कुर्वीत बध्वा मुद्राः पृथक्पृथक्॥ ध्यायेत्सदाशिवं साक्षाद्देवं सकलनिष्कलम्॥ ४७॥
One should also offer obeisances by tying the mudras separately. One should meditate on Sadashiva, the direct God, the all-pure.
english translation
namaskAraM ca kurvIta badhvA mudrAH pRthakpRthak॥ dhyAyetsadAzivaM sAkSAddevaM sakalaniSkalam॥ 47॥
hk transliteration by Sanscript