Anandakanda 1.16.124

1.16.124

evaṃ samprārthayitvādau paścānmantraṃ samuccaret /
oṃ śrīṃ hrīṃ taṃ amṛteśvari ehi ehi mama sakalasiddhiṃ kuru huṃ phaṭ /
anenaiva tu mantreṇa nikhanet siddhimūlikām //

Having prayed in this manner first, he should then pronounce the mantra: / 'Oṃ śrīṃ hrīṃ taṃ, O Lady of Nectar, come, come! Accomplish all my perfections! Huṃ phaṭ!' / With this very mantra he should dig up the root of perfection.