Sayyiduna Samurah (may Allah be pleased with him) states: The Prophet (peace and blessings be upon him) used to say to us: "Firdaws is the middle elevated ground of Paradise, which is its highest and most beautiful part."
Al-Bazzar recorded it; its chain contains Yusuf bin Khalid al-Samti, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب أهل الجنة / 18650