Bulugh al-Maram
Book 2, Hadith 384
Arabic hadith text
وَفِي رِوَايَةٍ لِمُسْلِمٍ: { وَهِيَ سَاعَةٌ خَفِيفَةٌ } 1 .1 - مسلم (852) (15).
Translation
A narration of Muslim has
"This time is brief."