This 3 verse passage from the Quran instructs believers to have faith in what has been revealed to them as well as what was revealed to previous prophets and scriptures, and to be certain of the existence of an afterlife.

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Who believe in what has been revealed to you
and what was revealed to those before
you, and are certain of the Hereafter.
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(Quran Surah 2, Ayah 4)