Section 39 of IPC : Section 39: "Voluntarily"

Explanation using Example

Example 1:

Ravi, in an attempt to scare his neighbor, lights a firecracker and throws it into the neighbor's garden. The firecracker explodes and causes a small fire, which spreads and damages the neighbor's house. Ravi did not intend to cause the fire, but he knew that throwing a firecracker could likely cause such damage. Therefore, Ravi caused the damage voluntarily.

Example 2:

Priya, during a heated argument with her colleague, pushes him in anger. The colleague falls and hits his head on a sharp object, resulting in a serious injury. Priya did not intend to cause such a severe injury, but she knew that pushing someone could likely result in harm. Hence, Priya caused the injury voluntarily.