Is there a defect in reciting al-Fatihah by saying "ahdina" with the accusative case instead of saying "ihdina," such that his prayer is not valid?

Question:
He says: Honorable Shaykh, may Allah grant you success, I heard on the Quran radio that if one makes a defect in reciting al-Fatihah by saying "ahdina" with the accusative case instead of saying "ihdina," his prayer is not valid.

Answer:
Yes, this changes the meaning, because "ahdina" is not the same as guidance. "Ahdina" means a gift, while guidance means showing the way, directing, and establishing upon the truth. So the meaning differs. Yes, if this happens in the prayer, it invalidates it, unless he does not know how to recite properly and does not know anything other than this; then his prayer is valid, but it is obligatory for him to learn al-Fatihah in the future. Yes.