Muhammad bn 'Amr bn Hazm (radhiyal Laahu 'anh) narrates: the Prophet(salla Laahu 'alyhi wasallam) said:

'No muslim will condole his brother over his affliction except that Allaah adorns him with adornments of honor on the day of qiyaamah'

-Bn Majah #1601. Shaykh Saleem al Hilaalee graded it as 'hasan' in Saheehul Adhkaarin Nawawiyyah #339.