Surah Al-Qamar, ayah 8

54:8

مُّهۡطِعِينَ إِلَى ٱلدَّاعِۖ يَقُولُ ٱلۡكَٰفِرُونَ هَٰذَا يَوۡمٌ عَسِرٞ ٨

Mmuhti'īna ilad-dā'i yaqūlul-kāfirūna hādhā yawmun 'asir

Racing ahead toward the Caller. The disbelievers will say, "This is a difficult Day."