Jahannam Has Been Forbidden for Kalima-I Shahadah

“Allah has forbidden jahannam for any servant who has testified earnestly that there is no God but Allah and Muhammad is the Messenger of Allah.” (Bukhari)
According to the ahl-i sunnah doctrine, any believer who has done even a tiny good deed, will enter jannah after punishment of his sins. No one who has passed away as a Muslim will stay in the hell for ever. (Kutub-I Sitta)