aṅguly-aṅguṣṭha-parvasu

kara-nyasam-the ritual known as kara-nyasa, which assigns the syllables of the mantra to the fingers; tatah-thereafter; kuryat-should execute; dvadasa-aksara-composed of twelve syllables; vidyaya-with the mantra; pranava-adi-beginning with the omkara; ya-kara-antam-ending with the syllable ya; aṅguli-on the fingers, beginning with the index finger; aṅgustha-parvasu-to the joints of the thumbs.