Hi,
While it’s never without some negative kamma to intentionally lie, there are circumstances in which practitioners who have not yet realized Stream-Entry or beyond may face situations in which the intention to lie is mixed with an intention for kindness or compassion.
Rather than relatively lightweight issues about parties, what if someone with a knife was chasing a child running away from them? You see the child turn left to hide in a building. The attacker runs up to you, says he saw you and the child near each other and asks if the child ran into that building.
Any response other than a non-lie obviously could lead to great harm or death to the child. I suppose just standing there and shrugging might work, but the attacker might run into the suspected building.
So maybe you lie and misdirect. Not bright kamma, yet mixed with a good intention for safety. This is called kamma that is mixed dark and bright. A sutta that teaches about this is MN57:
““Puṇṇa, I declare these four kinds of deeds, having realized them with my own insight. What four?
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There are dark deeds with dark results;
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bright deeds with bright results;
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dark and bright deeds with dark and bright results; and
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neither dark nor bright deeds with neither dark nor bright results, which lead to the ending of deeds. These are the intentions associated with the noble eightfold path.”
Also see AN4.233:
“And what are dark and bright deeds with dark and bright results? It’s when someone makes both hurtful and pleasing choices by way of body, speech, and mind. Having made these choices, they are reborn in a world that is both hurtful and pleasing, where hurtful and pleasing contacts strike them. Touched by both hurtful and pleasing contacts, they experience both hurtful and pleasing feelings that are a mixture of pleasure and pain—like humans, some gods, and some beings in the underworld. These are called dark and bright deeds with dark and bright results.
And what are neither dark nor bright deeds with neither dark nor bright results, which lead to the ending of deeds? It’s the intention to give up dark deeds with dark results, bright deeds with bright results, and both dark and bright deeds with both dark and bright results. These are called neither dark nor bright deeds with neither dark nor bright results, which lead to the ending of deeds.”
So we incline as best we can towards giving up intentions towards the first three kinds of deeds. But along the way we’re probably involved, to greater or lesser degrees, in “the grey” zone of both dark and bright. (Recall that these deeds/intentions involve more than only telling a lie).