Qur'an 24:63

لَّا تَجْعَلُوا۟ دُعَآءَ ٱلرَّسُولِ بَيْنَكُمْ كَدُعَآءِ بَعْضِكُم بَعْضًا ۚ قَدْ يَعْلَمُ ٱللَّهُ ٱلَّذِينَ يَتَسَلَّلُونَ مِنكُمْ لِوَاذًا ۚ فَلْيَحْذَرِ ٱلَّذِينَ يُخَالِفُونَ عَنْ أَمْرِهِۦٓ أَن تُصِيبَهُمْ فِتْنَةٌ أَوْ يُصِيبَهُمْ عَذَابٌ أَلِيمٌ

“Do not make [your] calling of the Messenger among yourselves as the call of one of you to another. Already Allāh knows those of you who slip away, concealed by others. So let those beware who dissent from his [i.e., the Prophet's] order, lest fitnah strike them or a painful punishment.”

An-Noor 24:63 · Saheeh International