Zaid bin Arqam (May Allah be pleased with him) reported:
I saw some people performing Duha (prayers) in the early forenoon and warned them (saying): These people must know that performing Salat a little later is better. The Messenger of Allah ﷺ said, "The Salat of the penitent is to be observed when the young ones of camels feel the heat of the sun (i.e., when it becomes very hot)."

[Muslim].

عن زيد بن أرقم رضي الله عنه أنه رأى قومًا يصلون من الضحى، فقال: أما لقد علموا أن الصلاة في غير هذه الساعة أفضل، إن رسول الله ﷺ قال:
"صلاة الأوابين حين ترمض الفصال". ((رواه مسلم)).