Read hadith ; know yourselves by hadith
Bismillahir rajhmaanir raheem
Narrated Ibn Abbas , The messenger of Allah (S) said : verily Allah has pardoned for me my ummah : their mistakes forgetfulness and that which they have been forced to do under duress .
Narrated Abu ‘Amr and Amrah – Sufyan bin Abdullah ath – Thaqafee, The messenger of Allah(S) said : I said , ” O messenger of Allah(S) , , tell me something about al-Islam which I can ask of no one but you . ” He said , “say I believe in Allah – and then be steadfast .”