An-Nahl · 16:94

94. Do not make your oaths a means of deception thereby allowing you to trick and deceive one another, following your desires - breaking them whenever you wish and fulfilling them when you wish. If you do so your feet will slip from the straight path after being firm on it. You will taste the punishment on account of your deviation from Allah’s path and your misleading others from it and you will receive multiplied punishment.