Do not make your deeds fruitless:

Allaah تعالى said:

﴿يَا أَيُّهَا الَّذِينَ آمَنُوا لا تَرْفَعُوا أَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ وَلا تَجْهَرُوا لَهُ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ أَنْ تَحْبَطَ أَعْمَالُكُمْ وَأَنْتُمْ لا تَشْعُرُونَ﴾

{O you who believe! Raise not your voices above the voice of the Prophet (صلى الله عليه وسلم), nor speak aloud to him in talk as you speak aloud to one another, lest your deeds may be rendered fruitless while you perceive not.} [Surah al-Hujuraat (49):2]

Imaam Ibn al-Qayyim رحمه الله said:

“If just raising their voices above the voice of the Prophet صلى الله عليه وسلم was a reason to make their deeds fruitless (and futile), then what about those who give precedence to their own opinions, intellects, preferences, politics, and understanding over and above that which the Prophet صلى الله عليه وسلم came with? Is it not that these are more liable to have their deeds rendered futile?”

[I`laam al-Mooqi`een (1/41)]