Commitment to Charity Before the Wedding

Hello, my wife committed before the wedding that she would give a certain percentage of her first salary to charity. Now we are married, and the question is whether I am obligated to give? Also, how much should be given since in the first instance she received a salary only for half a month because she started working in the middle of the month?

Hello 

She is obligated to give the amount from the first salary she received. 

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