Hadith #2514 (Sunan Ibn Majah)
Book: The Chapters on Jihad
Narrator(s): Abdullah bin Yamyn عبد الله بن يامين, Abu Hurairah, Muhammad bin al-Mu'ml bin al-Sbah محمد بن المؤمل بن الصباح, Sa'id bin al-Sa'ib bin Ysar سعيد بن السائب بن يسار

“The horizons will be opened to you, and you will conquer a city called Qazvin. Whoever is stationed there for forty days or forty nights, will have pillars of gold in Paradise, with green chrysolite and topped by a dome of rubies. It will have seventy thousand doors, at each door will be a wife from among the wide-eyed houris.’”

Source: https://parallelquran.com/hadith/sunan-ibn-majah-2514/