Sanskrit

सर्वस्रोतोनिबन्धेन प्राणशक्त्योर्ध्वया शनैः।
पिपीलस्पर्शवेलायाम् प्रथते परमं सुखम्॥ ६७॥

Transliteration

sarvasrotonibandhena prāṇaśaktyordhvayā śanaiḥ |
pipīlasparśavelāyām prathate paramaṁ sukham || 67 ||

Translation

By blocking all the channels (of perception) the prana-shakti moves slowly upwards (through the spinal column). At that time, feeling the sensation of an ant crawling in the body, one experiences the supreme bliss.