Vowing to give away the whole salary if appointed as a teacher

Q: I made a vow to give all my salary in charity if I became a teacher. It is worth mentioning that I am not quite sure of this vow, but it is most likely true. My question is: What should I do with my salary which is 4,200 Riyals? Am I permitted to take it in order to avoid asking people, especially that I am married and have two kids. My living necessities are many and I am separated from my husband due to Shar`y (Islamically lawful) reasons, but divorce has not occurred yet. Besides, I have a maid servant.

A: It is sufficient to give in charity one third of your salary, for the Prophet (peace be upon him) said to one who vowed to give all his property in charity, A third, i.e. of your property, is enough for you. Reported by Abu Dawud. (Part No. 23; Page No. 226) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.