Shiva Purana
पञ्च ब्रह्माणि विन्यस्य शिरः पादावसानकम् ॥ मुण्डवत्क्रकलाभेदैः प्रणवस्य कला अपि ॥ ३८ ॥
Placing the five Brahmans on the head and the ends of the feet The arts of the oṁkāra are also different from the arts of the muṇḍavatkra.
english translation
paJca brahmANi vinyasya ziraH pAdAvasAnakam ॥ muNDavatkrakalAbhedaiH praNavasya kalA api ॥ 38 ॥
hk transliteration by Sanscript