What are Ibn al-Qayyim's sources for describing the Houris in his Nuniyyah, and what is the extent of the authenticity of that?

"Al-Kafiyah Al-Shafiyah fi Al-Intisar li Al-Firqah Al-Najiyah" by Ibn Al-Qayyim is a great and masterful book in affirming the creed of the righteous predecessors. It is derived from the Quran, the Sunnah, and the sayings of the Companions, comprising approximately 6,000 verses. It has several commentaries. In it, Ibn Al-Qayyim included a comprehensive chapter on the description of Paradise and what Allah has prepared for His allies. It is worth noting that the aesthetic descriptions in poetic compositions may rely on metaphor and allusions, and the student of knowledge should pay attention to them and not dispense with them.