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

خَيرُ الاُمورِ عَزائمُها، وشَرُّ الاُمورِ مُحْدَثاتُها.

'The best of matters are the religious obligations and the worst of them are the innovations.'

Source: al-Ikhtisas, p. 342