Malik bin Yukhamir al-Saksaki (may Allah have mercy on him) narrates from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "No soul dies having with Allah even the weight of an ant of good, except that it is sealed over with clay (that is, it is preserved)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17345