Full Sharh — Mishkat al-Masabih 1243
وَعَنْ زَيْدِ بْنِ أَرْقَمَ أَنَّهُ رَأَى قَوْمًا يُصَلُّونَ مِنَ الضُّحَى فَقَالَ: لَقَدْ عَلِمُوا أَنَّ الصَّلَاةَ فِي غَيْرِ هَذِهِ السَّاعَةِ أَفْضَلُ إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «صَلَاةُ الْأَوَّابِينَ حِينَ تَرْمَضُ الْفِصَالُ» . رَوَاهُ مُسْلِمٌ
English Translation
Zaid b. Arqam, on seeing some people praying in the forenoon, said:: They well know that prayer at another time than this is more excellent. God’s Messenger said, “The prayer of those who are penitent is observed when the young weaned camels feel the heat of the sun.”* * Young camels are said to feel the sand too hot when a quarter of the day has passed. Muslim transmitted it.
Source
Mishkat al-Masabih(مشكاة المصابيح)
Prayer
Hadith Number
1243