Shiva Purana
दर्भाग्रैः संस्पृशंस्तं च विद्ययात्मानमाविशेत् ॥ नमस्कृत्य महादेवं नाडीसंधानमाचरेत् ॥ ४१ ॥
Touching the tips of the palm trees, one should enter into the self of knowledge. After offering obeisances to Lord Mahādeva, one should perform the nadī-sandhana.
english translation
darbhAgraiH saMspRzaMstaM ca vidyayAtmAnamAvizet ॥ namaskRtya mahAdevaM nADIsaMdhAnamAcaret ॥ 41 ॥
hk transliteration by Sanscript