Hawzah News Agency – The commander of the faithful Imam Ali peace be upon him says:

مَنِ استَقصى‏ على‏ صَدِيقِهِ انقَطَعَت مَوَدَّتُه.

 ‘He who penetrates deeply into his friend’s affairs, his love for him comes to an end.’

Source: Ghurar al-Hikam, no. 8582