Hadith #472 (Jami' al-Tirmidhi)
Book: The Book on Al-Witr
Narrator(s): Abu Karayb, Muhammad bin al-'Ala' محمد بن العلاء - أبو كريب, Anas ibn Malik, Ibn Ishaq محمد بن إسحاق بن يسار‎, Musa bin Flan bin Ans موسى بن فلان بن أنس بن مالك, Yunus bin Bukayr al-Shaybani يونس بن بكير بن واصل الشيباني

Allah’s Messenger said: “Whoever prays twelve Rak’ah of Ad-Duha, Allah will build a castle made of gold for him in Paradise.”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-472/