Uthmaan Ibn Affan
said:

The believer has five types of fear.

The first is that Allah may take his faith away from him

The second is that the recording angels may write down something that may expose him on the Day of Resurrection

The third is that the shaytan may cause his deeds to become invalid

The fourth is that the Angel of Death may come to him without warning

The fifth is that this world may tempt him and distract him from the Hereafter.

Fara'id al-Kalam li'l-Khulafa al-Kiram, p278