Hadith #2530 (Jami' al-Tirmidhi)
Book: Chapters on the description of Paradise
Narrator(s): al-Husain bin Qays al-Rhby الحسين بن قيس الرحبي, Ata' bin Abi Rabah عطاء بن أبي رباح, Hameed bin Musa'da bin al-Mubarak حميد بن مسعدة بن المبارك, Husayn bin Nmyr al-Kndy Thm حصين بن نمير, ibn Mas'ud, ibn Umar

“In Paradise, there are a hundred levels, what is between every two levels is like what is between the heavens and the earth. Al-Firdaus is ts highest level, and from it the four rivers of Paradise are made to flow forth. So when you ask Allah, ask Him for Al-Firdaus.”  Another chain reports a similar narration.

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-2530/