The Messenger of Allah ﷺ said, "Whoever is diligent in praying the two units of Duha will have his sins forgiven, even if they are like the foam of the sea."
حدثنا أبو بكر بن أبي شيبة حدثنا وكيع عن النهاس بن قهم عن شداد أبي عمار
قال رسول الله ﷺ من حافظ على شفعة الضحى غفرت له ذنوبه وإن كانت مثل زبد البحر
[Its chain is daif] Tirmidhi transmitted it, in Witr, chapter on what has been said about the prayer of Duha, no. 476, from the hadith of Nahhas, and he said, "We do not know it except through his hadith." This Nahhas is daif, as stated in Taqrib and other works.