One verse

Srimad Bhagavatam 6.8.8-10

6.8.8-10

न्यसेद्‌धृदय ओंङ्कारं विकारमनु मूर्धनि । षकारं तु भ्रुवोर्मध्ये णकारं शिखया न्यसेत् ॥ ८ ॥ वेकारं नेत्रयोर्युञ्‍ज्यान्नकारं सर्वसन्धिषु । मकारमस्त्रमुद्दिश्य मन्त्रमूर्तिर्भवेद् बुध: ॥ ९ ॥ सविसर्गं फडन्तं तत्सर्वदिक्षु विनिर्दिशेत् । ॐ विष्णवे नम इति ॥ १० ॥

nyased dhrdaya omkaram vi-karam anu murdhani sa-karam tu bhruvor madhye na-karam sikhaya nyaset ve-karam netrayor yunjyan na-karam sarva-sandhisu ma-karam astram uddisya mantra-murtir bhaved budhah savisargam phad-antam tat sarva-diksu vinirdiset om visnave nama iti

nyaset
should place
hrdaye
on the heart
omkaram
the pranava, omkara
vi-karam
the syllable vi of visnave
anu
thereafter
murdhani
on the top of the head
sa-karam
the syllable sa
tu
and
bhruvoh madhye
between the two eyebrows
na-karam
the syllable na
sikhaya
on the sikha on the head
nyaset
should place
vekaram
the syllable ve
netrayoh
between the two eyes
yunjyat
should be placed
na-karam
the syllable na of the word namah
sarva-sandhisu
on all the joints
ma-karam
the syllable ma of the word namah
astram
a weapon
uddisya
thinking
mantra-murtih
the form of the mantra
bhavet
should become
budhah
an intelligent person
sa-visargam
with the visarga (h)
phat-antam
ending with the sound phat
tat
that
sarva-diksu
in all directions
vinirdiset
should fix
om
pranava
visnave
unto Lord Visnu
namah
obeisances
iti
thus

One must then chant the mantra of six syllables [om visnave namah]. One should place the syllable om on his heart, the syllable vi on the top of his head, the syllable sa between his eyebrows, the syllable na on his tuft of hair [sikha], and the syllable ve between his eyes. The chanter of the mantra should then place the syllable na on all the joints of his body and meditate on the syllable ma as being a weapon. He should thus become the perfect personification of the mantra. Thereafter, adding visarga to the final syllable ma he should chant the mantra mah astraya phat in all directions, beginning from the east. In this way, all directions will be bound by the protective armor of the mantra.