Hadith 431

Bulugh al-Maram

Book 2: The Book of Prayer
وَفِي رِوَايَةٍ لِلْبُخَارِيِّ: {حَتَّى تَنْجَلِي} 1‏ .‏
In a narration of al-Bukhari it has:

"till it becomes bright."