Anandakanda 1.21.30

1.21.30

pratilomaṃ samuccārya mantraṃ mṛtyuñjayaṃ japet /
tāraṃ madhye sasādhyākhyaṃ digdale bhaṃ samālikhet //

pronounced in reverse order—one should recite the Mṛtyuñjaya mantra. / In the center, one should write the praṇava together with the name of the person to be mastered; on the petals of the cardinal directions, the letter bha;