Hadith 1143
Zaid bin Arqam (May Allah be pleased with him) reported:
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 صلى الله عليه وسلم قال: "صلاة الأوابين حين ترمض الفصال" . ((رواه مسلم)).
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].
In plain words
Seeing people pray Duha very early, Zaid bin Arqam noted that praying it a little later is better, recalling the Prophet's words that this prayer is best offered once the sun has climbed and the day has grown warm.
Reference : Riyad as-Salihin 1143 In-book reference : Book 8, Hadith 153