ٱلَّذِينَ يُؤْمِنُونَ بِٱلْغَيْبِ
"Those Who believe in the unseen"
Explanation by Ibn Abbas: Unseen that means which is hidden from our sight such as Paradise, hell, the Bridge over hell, the Scale, the Resurrection, the Reckoning, etc. It is also said that the unseen is Allah Himself...