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When I did Sa’i between al-Safa and al-Marwah, my wudu became invalidated, and I could not go out to renew my wudu. This happened to me during Tawaf al-Wada` as well.
Praise be to Allah.
Your Sa`i between al-Safa and al-Marwah is valid, even if it was done without wudu because having wudu is not a condition of Sa`i . But your Tawaf al-Wada` was not valid, because one of the conditions of Tawaf is that you should be pure.
So you have to repeat it so long as you are still in Makkah, but if you have left and gone back to your country, then you have to have a sacrifice offered in Makkah and given to the poor.
And Allah knows best.