iti.25 Itivuttaka

Lying

“Mendicants, for an individual who transgresses in one thing, there is no bad deed they would not do, I say.
This was said by the Buddha, the Perfected One: that is what I heard.
What one thing?
It is this: telling a deliberate lie.”
The Buddha spoke this matter.
On this it is said:
“When a person, spurning the hereafter,
transgresses in just one thing—
lying—
there is no evil they would not do.”
This too is a matter that was spoken by the Blessed One: that is what I heard.