Our beloved Prophet ﷺ said that whosoever utters لا الہ الا اللہ with sincerity will enter the paradise. Someone asked what sincerity is, he replied, ‘abstaining from wrong deeds’ (tabrani)
Our beloved Master ﷺ said that whosoever recites لا الہ الا اللہ has all the doors of heavens opened for him and this recitation then reaches to the Throne of Allah provided that the recitor abstains from all the wrongs. (Tirmidhi) (JG)