The Prophet (peace and blessings be upon him) said:
"Indeed, Allah Almighty has closed the door of repentance to every person of innovation (until he abandons his innovation)."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 1699
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[ابن فيل طس هب الضياء] عن أنس. الصحيحة ١٦٢٠.