كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 395
Narrated Zaid bin Arqam (RA):
Allah's Messenger (ﷺ) said: "The prayer of those who are penitent is offered when the young weaned camels feel the heat of the sand." [Reported by at-Tirmidhi].
وَعَنْ زَيْدِ بْنِ أَرْقَمَ; أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ: { صَلَاةُ اَلْأَوَّابِينَ حِينَ تَرْمَضُ اَلْفِصَالُ } رَوَاهُ اَلتِّرْمِذِيُّ .‏ 1‏ .‏
Reference : Bulugh al-Maram 395
In-book reference : Book 2, Hadith 395
English translation : Book 2, Hadith 390
Hadith Text
Reference