Some scholars such as Ibn Othaimeen said that this is recommended. However, this is not part of the sunnah!

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The Surah in the first two rakah is sunnah but if a Muslim skips it, the prayer is valid. And if he adds a surah in the last two rakah, this is permissible.

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It is not permissible to close your eyes during salah unless it is something distracting you on a particular Salah and not as a usual habit.

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