According to the Upanishads, bad actions (often referred to as papa or evil deeds) are those rooted in ignorance (avidya), selfish desires (kama), and actions that harm others or violate cosmic order (dharma). The earliest, most defining text, the Brihadaranyaka Upanishad (4.4.5), directly states: "A man turns into something good by good action and into something bad by bad action".Bad actions earning bad karma include:Selfish Desire and Attachment: Actions taken solely for personal gain, ignoring the unity of all beings, create karmic bondage.Harm and Cruelty: Intentional cruelty, causing pain to any living being—including harsh words, manipulation, and physical harm—is considered highly negative.Dishonesty and Immorality: Lying, cheating, betrayal of trust, and arrogance.Violation of Dharma: Engaging in adharmic (unrighteous) acts that disrupt the cosmic, moral, or social order.Neglecting Self-Knowledge: The highest form of negligence, according to the Upanishads, is identifying solely with the body and ego rather than seeking the true Self (Atman), which perpetuates the cycle of ignorance and rebirth.Key Concepts of Bad Karma in the UpanishadsDesire as the Root: The Upanishads explain that a person consists of desires, and as they desire, they act, creating karma that leads to further rebirth.Reap What You Sow: The Upanishads articulate the early doctrine of moral cause and effect, where evil actions lead to sinful outcomes (papa).Not Just Actions, but Motives: Bad karma is not just the act, but the mental intention (sankalpa) and desire behind it.In summary, any action that strengthens the ego, causes suffering to others, or leads one further away from the realization of the unity of all life is considered a "bad action" that accrues negative karma.