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

إن أرَدتَ أن يَصفُوَ لكَ وُدُّ أخِيكَ فلا تُمازِحَنَّهُ، ولا تُمارِيَنَّهُ، ولا تُباهِيَنَّهُ، ولا تُشارَّنَّهُ.

 ‘If you want the exclusive love of your brother, then do not ever make fun of him, nor quarrel with him, nor compete against him, nor be malicious to him.’

Source: Bihar al-Anwar, v. 78, p. 291, no. 2