Sunan Ibn Majah
1141
Sahih+2

It was narrated from Umm Habibah bint Abi Sufyan that the Prophet (ﷺ) said:“Whoever performs twelve Rak’ah (of Sunnah) during the day and night, a house will be built for him in Paradise.”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi