Hadithcore
Mishkat al-Masabih, 107
graded· Zubair `Aliza'i

He also reported God’s messenger as saying, “The Qadariya are the Magians of this people. If they are ill, do not visit them, and if they die, do not attend their funerals." Ahmad and Abu Dawud transmitted it.

وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْقَدَرِيَّةُ مَجُوسُ هَذِهِ الْأُمَّةِ إِنْ مَرِضُوا فَلَا تَعُودُوهُمْ وَإِنْ مَاتُوا فَلَا تشهدوهم» . رَوَاهُ أَحْمد وَأَبُو دَاوُد

References1 variant
In-Book Reference
Book 1, Hadith 100