Sayyiduna Fadalah bin Ubayd (may Allah be pleased with him) narrates: I heard the Messenger of Allah (peace and blessings be upon him) say: "I am a guarantor - and 'za'im' means guarantor - for whoever believes, accepts Islam and emigrates, that he will have a house on the outskirts of Paradise, a house in the middle of Paradise, and a house in the highest part of Paradise. Whoever does that has left no good unsought and no escape from evil untaken, so let him die whenever he wishes to die (that is, he is successful)."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15892