40 Hadith Nawawi 5

On the authority of the mother of the faithful, Aaishah (may Allah be pleased with her), who said:

The Messenger of Allah ﷺ said, “He who innovates something in this matter of ours [i.e., Islam] that is not of it will have it rejected [by Allah].”

[Al-Bukhari]
[Muslim]
In one version by Muslim it reads: “He who does an act which we have not commanded, will have it rejected [by Allah].”

عَنْ أُمِّ الْمُؤْمِنِينَ أُمِّ عَبْدِ اللَّهِ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا، قَالَتْ: قَالَ: رَسُولُ اللَّهِ ﷺ "مَنْ أَحْدَثَ فِي أَمْرِنَا هَذَا مَا لَيْسَ مِنْهُ فَهُوَ رَدٌّ[رَوَاهُ الْبُخَارِيُّ]
، [وَمُسْلِمٌ]
.
وَفِي رِوَايَةٍ لِمُسْلِمٍ
:مَنْ عَمِلَ عَمَلًا لَيْسَ عَلَيْهِ أَمْرُنَا فَهُوَ رَدٌّ" .