Zayd ibn Arqam reported: He saw some people performing the forenoon prayer, and he said, “They already know that prayer at a different time is better.” The Messenger of Allah, peace and blessings be upon him, said, “The forenoon prayer of the penitent is when young camels can feel the heat of the sun.”
Source: Ṣaḥīḥ Muslim 784
Grade: Sahih (authentic) according to Muslim
Imam al-Nawawi commented, “Our scholars said this is the best time to perform the forenoon prayer, although it is permissible to do so after the sun rises until it reaches its zenith.”
Source: Sharḥ al-Nawawī ‘alá Ṣaḥīḥ Muslim 6/30
عَنْ 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
784 كتاب صحيح مسلم كتاب صلاة المسافرين وقصرها باب صلاة الأوابين حين ترمض الفصال
قَالَ النَّوَوِيّ قَالَ أَصْحَابُنَا هُوَ أَفْضَلُ وَقْتِ صَلَاةِ الضُّحَى وَإِنْ كَانَتْ تَجُوزُ مِنْ طُلُوعِ الشَّمْسِ إِلَى الزَّوَالِ
6/30 شرح النووي على مسلم