Can a husband prevent his wife from performing Hajj al-Islam (the obligatory pilgrimage)?

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A husband is prohibited from preventing his wife from performing the obligatory Hajj (Hajj al-Islam). This ruling is held by Al-Nakha'i, Ishaq, Abu Thawr, and the Ahl al-Ra'y (School of Opinion), and it is the sounder of the two positions attributed to Al-Shafi'i. The evidence is that since the obligatory Hajj is a requirement (*fard*), the husband cannot prevent her from fulfilling it, analogous to the obligatory nature of fasting Ramadan and the five daily prayers.