ENOfficial
Abu Huraira reported God’s Messenger as saying, “If anyone perseveres in praying the two rak'as of the forenoon, his sins will be forgiven him, even if they are like the foam of the sea.” Ahmad, Tirmidhi and Ibn Majah transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ حَافَظَ عَلَى شُفْعَةِ الضُّحَى غُفِرَتْ لَهُ ذنُوبه وَإِن كَانَت مثلا زَبَدِ الْبَحْرِ» . رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيُّ وَابْنُ مَاجَهْ
sunnah.com