Hanafi
The sources give no view for it here.
الارتزاق على القضاء
هل يجوز للقاضي أن يأخذ رزقًا على القضاء؟
Each school’s answer
Hanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
١٨١٢ - مَسْأَلَةٌ: وَالِارْتِزَاقُ عَلَى الْقَضَاءِ جَائِزٌ لِلثَّابِتِ مِنْ قَوْلِهِ - عَلَيْهِ الصَّلَاةُ وَالسَّلَامُ - «مَنْ أَتَاهُ مَالٌ فِي غَيْرِ مَسْأَلَةٍ أَوْ إشْرَافِ نَفْسٍ فَلْيَأْخُذْهُ» وَبِاَللَّهِ تَعَالَى التَّوْفِيقُ. [مَسْأَلَة هَلْ للإمام عَزْل الْقَاضِي مَتَى شَاءَ]
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What bears this mark is in our words, our standard wording; the books’ texts stay as they are.