The Messenger of Allah ﷺ said, "Whoever is diligent in praying the Duha prayer, his sins will be forgiven, even if they are like the foam of the sea."
حدثنا محمد بن عبد الأعلى البصري حدثنا يزيد بن زريع عن نهاس بن قهم عن شداد أبي عمار
قال رسول الله ﷺ من حافظ على شفعة الضحى غفر له ذنوبه وإن كانت مثل زبد البحر
[Its chain of transmission is daif] Ibn Majah also narrated it in Iqamat al-Salawat, chapter on what has been said about the Duha prayer, no. 1382, from the hadith of Nahhas through the same route, and he is daif as stated in Taqrib and elsewhere.