Quran 70:4 from Surah Al-Ma'aarij on Divine Marvels.
تَعۡرُجُ ٱلۡمَلَٰٓئِكَةُ وَٱلرُّوحُ إِلَيۡهِ فِي يَوۡمٖ كَانَ مِقۡدَارُهُۥ خَمۡسِينَ أَلۡفَ سَنَةٖ
English translation: Ascend the Angels and the Spirit to Him in a Day [is] its measure (is) fifty thousand year(s)
Transliteration: ta'ruju al-malaikatu wal-ruhu ilayhi fi yawmin kana miq'daruhu khamsina alfa sanatin