It is narrated from Sayyiduna Khalid bin Ubayd al-Sulami (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Allah, the Mighty and Majestic, has granted you, at the time of your death, one third of your wealth as an increase in your deeds."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4114