Agnipurana 72.8

72.8

vāmapāṇitale kuryādbhāgatrayamudaṅmukhaḥ /
aṅgair dakṣiṇamekādyaṃ pūrvamastreṇa saptadhā //

facing north, one should make three portions on the palm of the left hand. / The right first part [one should recite over] seven times with the weapon [mantra] and the limbs;