Time for the Duha (Forenoon Optional) Prayer

Imam Al-Nawawi’s Riyad-us-Saliheen
Chapter 207
Time for the Duha (Forenoon Optional) Prayer

1143. 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 (sallallaahu ’alayhi wa sallam) 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).”