It is narrated from Sayyiduna Amr bin Ghaylan al-Thaqafi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said (in supplication): "O Allah, whoever believes in me, affirms me as truthful and knows that what I have brought is the truth from You, then lessen his wealth and children, make meeting You beloved to him, and hasten for him (the decree of death). And whoever does not believe in me, does not affirm me as truthful and does not know that what I have brought is the truth from You, then increase his wealth and lengthen his life."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14128