Good topic.
One example of a necessary evil in the Bible is found in the story of Joseph, as described in the Book of Genesis. Joseph, the son of Jacob, was sold into slavery by his jealous brothers. He was taken to Egypt, where he faced many trials and tribulations, including false accusations and imprisonment. However, his experiences in Egypt ultimately led to a positive outcome.
Joseph's ability to interpret dreams, a skill he developed while in prison, allowed him to gain favor with the Pharaoh. He eventually became a high-ranking official in Egypt and played a crucial role in managing the country during a severe famine. Joseph's position and his foresight in storing grain helped save Egypt and the surrounding region from starvation.
So, the evil of Joseph being sold into slavery and falsely imprisoned can be seen as a necessary part of God's plan to position him to save his family and many others from the famine. This story illustrates the biblical concept that sometimes hardships and suffering are part of a larger divine plan, which can ultimately lead to positive outcomes.