The Prophet (peace and blessings be upon him) said:
"May Allah have mercy on a servant who spoke good and so gained benefit, or kept silent from evil and so remained safe."
Hadith Referenceصحیح الجامع الصغیر / حرف الراء / 3496
Hadith Gradingالألبانی:حسن
Hadith Takhrij[ابن المبارك] عن خالد بن أبي عمران مرسلا. الصحيحة ٨٥٥.