To give an evidence or make a statement on oath, is called swear or declaration.
Studies show that it is not big and it is not so clever to swear but suggestions are it may actually be good in certain situations and not at all times. Swearing can help people cope with short-term stress and to maintain solidarity.
Where swearing can provide short-term relief from pain, there are chances that we may not experience much of relief if we do not reserve it for crises only. If we want to maintain solidarity, we must take care of the frequency of our swearing.
People having obsessive behaviors used to swear more often and people around them realize soon that they are perverts and they do not mean anything what they are saying. We should look into our deviant behaviors although they may change with the passage of time but still need to be taken care of.