an.4.211 Aṅguttara Nikāya (Numbered Discourses)
Assembly
“Mendicants, these four corrupt an assembly.What four?
A monk, nun, layman, or laywoman who is unethical, of bad character.
These are the four that corrupt an assembly.
Mendicants, these four beautify an assembly.
What four?
A monk, nun, layman, or laywoman who is ethical, of good character.
These are the four that beautify an assembly.”