The Noble Prophet (peace and blessings of Allah be upon him) said: "Whoever a person becomes Muslim at his hand, he will be his ally." This hadith is narrated from Sayyiduna Abu Umamah, Sayyiduna Tamim Dari, and Sayyiduna Rashid (may Allah be pleased with them).
Hadith Referenceسلسله احاديث صحيحه / الحدود والمعاملات والاحكام / 1296