大毘盧遮那成佛神變加持經蓮華胎藏悲生曼荼羅廣大成就儀軌供養方便會 2.238

2.238

At that time, the Bhagavat told Vajrapāṇi:
"There is an all-pervading, extremely profound secret Dharma gate;
one who abides in this syllable-gate swiftly accomplishes all undertakings.
With the jeweled crown hand-raising mudrā (five-pronged), distribute the wheels along the course of the body:
between the brows, throat, heart, and navel, from the syllable 'A' to 'Svāhā'.
Circling to the right, the wheels join one another; from the initial practice to the perfect quiescence of the fruit,
upāya is present everywhere, outside the body like blazing light;
the twelve syllables beginning with 'I' are scattered outside."