It is narrated from Hazrat Abu Qatadah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever presents a witness regarding a murdered person (that he is the killer), then all the belongings of the murdered person will be given to him.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22518