Standing up for the fourth rakaat in Witr Salaah
Q: I was reading witr salaah and sat in tashahhud for the third rakaat. After reciting the tashahhud, I went into the fourth rakaat by mistake. On completing the fourth rakaat, I made salaam and sajdah sahw. Is my witr valid? Also, what is the ruling in the case where I forgot to sit in the third rakaat for tashahhud?