And be not like the knitting woman who spins yarn with tremendous hard work, and then breaks it apart. She wastes with her own hands a whole day's labor at the spinning wheel. (Breaking solemn pledges could nullify your good deeds). This is an example for you, if you abuse your promises to take advantage of others. People usually do that to advance from others wrongfully, or help their own groups (57:20). Allah has devised this as a test of your character. (Human beings are the only creatures who can make a pledge. Breaking promises violates human rights and hurts your own "Self"). On The Day of Resurrection you will appear before your Lord with the imprints of your doings on your "Self". He will then make you understand the dispute between your word and your action and between your reason and emotions.