Sayyiduna al-Jarud al-Abdi (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) and said: I have a religion; if I leave my religion and enter your religion, is it assured for me that Allah will not punish me in the Hereafter? He (peace and blessings be upon him) said: "Yes."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2113