"Should any man's wife go astray"—Numbers 5:12.
In the event that a woman is suspected of adultery [and there is significant circumstantial evidence pointing to her infidelity], we are commanded to follow the pertinent laws detailed in the Torah. This includes her bringing a special meal offering in the Holy Temple and drinking a special potion.
"He shall pour no oil upon it"—Numbers 5:15.
It is forbidden to mix oil into the suspected adulteress' meal offering [as is done by almost all other meal offerings].
