It wasnarrated that Abu Hurairah said:
"The Messenger of Allah (ﷺ)said: 'Whoever regularly prays two Rak'ah of Duha, his sins willbeforgiven even if they are like the foam of the sea.'" (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1382 (JA)
Arabic reference (JA): Book 5, Hadith 1445 (JA)