Surah Al-Qamar, Verse 8

مُّهۡطِعِينَ إِلَى ٱلدَّاعِۖ يَقُولُ ٱلۡكَٰفِرُونَ هَٰذَا يَوۡمٌ عَسِرٞ٨

muh'ṭiʿīna ilā l-dāʿi yaqūlu l-kāfirūna hādhā yawmun ʿasirun

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