Is a wife obligated to obey her husband if he commands her to do something she considers a major sin, while he believes her refusal would lead to another major sin, given that their levels of religious knowledge are similar? And did the wife err in performing the prayer with only ablution (wudu') while in a state of ritual impurity (junub), even though ghusl (full ritual bath) was possible—albeit with difficulty—due to her eagerness to pray on time?

A wife is not obligated to obey her husband in what she deems forbidden. If a wife wakes up in a state of major ritual impurity (janabah) at the very end of the prayer time, and is unable to perform a full ritual bath (ghusl) due to the water being cold and the inability to heat it, then she must perform tayammum (dry ablution) and pray; wudu (minor ablution) is not sufficient. However, if she is able to heat the water, she is obligated to do so, even if the prayer time expires. The correct view is that a sleeping person who wakes up late should perform ghusl and pray even if the time has passed, if necessary, because their prayer time begins from the moment they wake up. This is the opinion of the majority of scholars. The wife was correct in her eagerness to perform ghusl and not be satisfied with merely wudu or tayammum. As for someone who is unable to perform ghusl, they must perform tayammum and pray within the time.