Silsilah as-Sahihah 3954 — Building materials of Paradise

It is narrated from Sayyiduna Abu Sa'id both as a mawquf and marfu' narration that "Allah, the Blessed and Exalted, created Paradise (the manner of its construction was that) one brick was of gold, one brick was of silver, and the mortar was of musk. Allah, the Exalted, said to it: Speak. It said: «قَدْ أَفْلَحَ الْمُؤْمِنُونَ» 'Indeed, the believers have succeeded' (23:1, Al-Mu’minun). The angels said: (O Paradise!) Glad tidings to you, you are the abode of kings."