Vowing to slaughter ten sheep but slaughtering one and having no means to slaughter more

Q: I am a 52-year old woman who suffered from epilepsy. I made a vow that if Allah (Exalted be He) helps me recover from this disease, I will slaughter ten sheep over the span of ten years for the sake of Allah (Exalted be He). I slaughtered one out of ten sheep, as my financial position does not allow me to slaughter this number of sheep. I ask your Eminence to tell me what I should do concerning this vow. Is it permissible to fast or give Sadaqah (voluntary charity) instead of slaughtering the sheep? If so, how many days should I fast or how much Sadaqah should I give? Is it permissible to transfer the Sadaqah from one country to another? How should I distribute it? Please advise!

A: You must fulfill the rest of the vow whenever it is possible, as Allah (Exalted be He) says, So keep your duty to Allâh and fear Him as much as you can May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.