What did the Prophet Muhammad (peace be upon him) say about appropriating a Muslim's right with false oaths, even if it was something insignificant like a twig of an arak tree?
 It is narrated on the authority of Abu Umama that the Messenger of Allah (may peace be upon him) observed:                      He who appropriated the right of a Muslim by (swearing a false) oath, Allah would make Hell-fire necessary for him and would declare Paradise forbidden for him. A person said to him: Messenger of Allah, even if it is something insignificant? He (the Holy Prophet) replied: (Yes) even if it is the twig of the arak tree.