Repeating the obligatory prayer that was performed facing a direction other than the qiblah is a lapse
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Q: I am a man who works as a military officer in the province of Khumays Mishayt , and for a full year I have been praying the sunnah and other voluntary prayers in my home facing a direction other than the qiblah , believing that to be the direction. My wife also prays the obligatory and voluntary prayers in the same wrong direction that I faced. I hope you will issue a ruling on this matter, as I did not discover this error until after a full year had passed. Thank you.
A: The questioner and his wife must repeat the obligatory prayers they performed facing a direction other than the qiblah, because they were negligent. Verifying the direction of the qiblah is easy within cities. It is not permissible for a person to rely on independent legal reasoning to determine the direction of the qiblah except in the desert when there is no one available to ask who knows the direction of the qiblah. This is because Allah (Mighty and Majestic) does not burden a soul beyond its capacity. As for the voluntary prayers that the questioner and his wife performed facing a direction other than the qiblah, it is not prescribed to repeat them, and it is hoped that they will receive the reward for those voluntary prayers.
A: The questioner and his wife must repeat the obligatory prayers they performed facing a direction other than the qiblah, because they were negligent. Verifying the direction of the qiblah is easy within cities. It is not permissible for a person to rely on independent legal reasoning to determine the direction of the qiblah except in the desert when there is no one available to ask who knows the direction of the qiblah. This is because Allah (Mighty and Majestic) does not burden a soul beyond its capacity. As for the voluntary prayers that the questioner and his wife performed facing a direction other than the qiblah, it is not prescribed to repeat them, and it is hoped that they will receive the reward for those voluntary prayers.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.