NUM206 … in the first rebellion against Torah authority, Korach and two hundred and fifty men from the tribe of Reuven protested against Moses' right to leadership [this verse]. The question has been asked by the commentaries how it is that Korach, who was from the tribe of Levi, teamed up with all these men from the tribe of Reuven. Many answers are offered (such as that Reuven, the eldest of Jacob's sons, felt cheated out of leadership, as did Korach), but Rashi (commentary on this verse) explains that the configuration of the camp regarding the various tribes and the tribe of Levi around the Tabernacle was such that the family of Korach (Kehat) were next-door neighbors of the tribe of Reuven. It was because of this proximity and their relationship that Korach influenced these people to join him ... peer pressure, the influence of those in the same physical proximity, impacted negatively.