Abu Umamah (May Allah bepleased with him) reported:
Messenger of Allah (ﷺ) said, "Allah decrees the (Hell) Fire and debars Jannah for the one who usurps the rights of a believer by taking a false oath." One man asked: "O Messenger of Allah! Even if it should be for an insignificant thing?" He said, "Even if it be a stick of the Arak tree (i.e., the tree from which Miswak sticks are taken)".[Muslim].
Arabic/English book reference: Book 1, Hadith 214