Shiva Purana
पादे मूर्ध्नि हृदि चैव मूर्ध्नि हृत्पाद एव च । हृत्पादमूर्ध्नि संप्रोक्ष्य मंत्रस्नानं विदुर्बुधाः २३ ।
The order is as follows:—feet, head, chest; head, chest, feet and chest, feet, head for sprinkling with water thrice.
english translation
pAde mUrdhni hRdi caiva mUrdhni hRtpAda eva ca । hRtpAdamUrdhni saMprokSya maMtrasnAnaM vidurbudhAH 23 ।
hk transliteration by Sanscript