It is narrated from Sayyiduna Ibn Amr (may Allah be pleased with him) that I heard the Noble Prophet (peace and blessings be upon him) saying: Whoever meets Allah in such a state that he does not associate anything with Allah, he will enter Paradise and no sin will harm him; just as if someone meets Allah in such a state that he is a polytheist, he will enter Hell and no good deed will benefit him.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 6586