مَنْ وَقَّرَ صَاحِبَ بِدْعَةٍ، فَقَدْ أَعَانَ عَلَى هَدْمِ الْإِسْلَامِ
Translation: Whoever honors a proponent of religious innovation has helped to undermine Islam.
Source: البيهقي
وَقَّرَ means “honored” or “treated with reverence.” صَاحِبَ بِدْعَةٍ refers in this context to someone who advances a religious innovation as part of the faith. فَقَدْ أَعَانَ gives the consequence, “has helped,” while عَلَى هَدْمِ describes helping to undermine or demolish.
The moral warning concerns lending authority to an unsound religious claim merely because its proponent is admired. It does not justify hasty accusations against people or mistreatment of those with whom one disagrees.