Mustadrak al-Hakim — Hadith 2422

It is narrated from Sayyiduna Fadalah bin Ubayd (may Allah be pleased with him): I heard the Messenger of Allah (peace and blessings be upon him) say: "I am a guarantor (za'im), and za'im means one who stands surety, for whoever believes, accepts Islam and strives in the path of Allah, that he will have a house in the outskirts of Paradise and a house in the middle of Paradise. And I am also a guarantor for whoever believes, accepts Islam and emigrates, that he will have a house in the outskirts of Paradise, a house in the middle of Paradise and a house in the highest part of Paradise. Whoever does these (deeds) has fulfilled every pursuit of good and found the way to escape every evil; now let death come to him wherever it will."
This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.