འཕགས་པ་ཤན་ཏ་རྒྱས་པ་ཆན་པའ་སྡ་ཉ་མའ་སྙང་པ་ཞས་བྱ་བའ་མད 4.15

4.15

[…] adopt the paths of the ten virtuous actions, delight in generosity, self-control, and restraint, and be afraid of the afterlife. I asked them what are the mantras and medicines through which I could ripen those sentient beings, and so those perfect buddhas of the past taught me this great teaching—a mantra formula, a dhāraṇī mantra called the peaceful core of knowledge, through which I could ripen infinite myriads of beings and establish them in the six perfections.

“With firm diligence and resolution, in all my lives I continuously protected pregnant women with this dhāraṇī mantra, this mantra formula, this vidyā mantra called the peaceful core of knowledge. I established in the three objects of refuge these women and the children in their wombs. From then on, those pregnant women and their children could not be hurt or injured, and their bodies, elements, and minds could no longer be disturbed by gods or any other beings, including māras, apasmāras, humans, and nonhumans. The world with its gods and asuras could no longer rob their vitality or hurt them with any medicines or mantras. Pregnant mothers would not be harmed by them anymore, and the children present in their wombs would remember their previous lives. The bodies of those beings who had entered the womb would have perfectly developed faculties, beautiful and elegant appearances, and excellent complexions which are replete with the most delightful features. They would be highly intelligent and emerge from the bellies of their mothers with ease