What defines the obedience of a wife to her husband? What does Islam say about obedience? What are the conditions and rulings surrounding this?

Full obedience is given to no one but Allah SWT and His messenger. Any other obedience is conditioned, depending on cultural norm. No one should be burdened with more than they can bear, and this applies to asking things of your spouse that may not be reasonable.

Shaykh Waleed Basyouni answers in detail.

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