Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

مَن كانَ باللَّهِ أعْرَفَ كانَ مِن اللَّهِ أخْوَف.

'The one who knows Allah the most is the one who fears Allah the most.'

Source: Bihar al-Anwar, v. 70, p. 393, no. 64