It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There is no faith for the one who has no trustworthiness. By the One in whose hand is my soul, you will not enter Paradise until you believe."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7767