Hawzah News Agency – Imam al-Hadi peace be upon him says:

المِراءُ يُفسِدُ الصَّداقَةَ القَديمَةَ، ويُحَلِّلُ العُقدَةَ الوَثِيقَةَ، وأقَلُّ ما فيهِ أن تَكونَ فيهِ المُغالَبَةُ، والمُغالَبَةُ اُسُّ أسبابِ القَطيعَة.

 ‘The quarrel corrupts a long friendship and dissolves strong ties, the least of it is that one tries to overcome the other, and strife is the main cause of a break in friendship.’

Source: Alam al-Din, no. 311