Lend your ear to the Qur’aan:

بسم الله والحمد لله والصلاة والسلام على رسول الله ، وبعد

Ibn Mas`ood رضي الله عنه and other scholars of the Salaf said: “When you hear Allaah تعالى saying in the Qur’aan:

( يَـأَيُّهَا الَّذِينَ ءَامَنُواْ )

{O you who believe!}, then listen with full attention, for it is either some goodness that Allaah تعالى is enjoining, or an evil that He is forbidding.” [Tafseer Ibn Katheer; Surah al-Baqarah (2): 23]

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Shaikh Ibn al-`Uthaymeen رحمه الله said:

❝The phrase {O you who believe!} indicates that acting upon the command with firm belief or complete obedience is one of the requisites of Imaan.

Similarly, it also indicates that opposing the command or doubting it or belying it is the negation of Imaan – either in total or in perfection (i.e. either a person may lose his Imaan completely or there will be deficiency in it).

Thirdly, in this there is motivation and allurement for the one being addressed, as if He تعالى is saying: If you truly believe, then hear and obey.❞

[Tafseer of Surah al-Maaidah (5): 90 by Shaikh Ibn al-`Uthaymeen]