ENOfficial
Jabir b. Samura told that he heard God's messenger say, "A band of the Muslims will certainly gain the treasure of the family of Kisra which is in al-Abyad." * *A fortress in the Persian capital al-Mada'in. Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ جَابِرِ بْنِ سَمُرَةَ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «لَتَفْتَحَنَّ عِصَابَةٌ مِنَ الْمُسْلِمِينَ كَنْزَ آلِ كِسْرَى الَّذِي فِي الْأَبْيَض» . رَوَاهُ مُسلم
sunnah.com