Sura 17 Al-Isra (The Night Journey), ayah 85

1. وَيَسْأَلُونَكَ عَنِ الرُّوحِ ۖ قُلِ الرُّوحُ مِنْ أَمْرِ رَبِّي وَمَا أُوتِيتُمْ مِنَ الْعِلْمِ إِلَّا قَلِيلًا

   And they ask you, (O Muhammad), about the soul. Say, "The soul is of the affair of my Lord. And mankind have not been given of knowledge except a little."

   17:85

Translation: Saheeh International