It has been narrated on the authority of Hisham (who learnt it from his father) that the Messenger of Allah ﷺ said (to Sa'd): You have adjudged their case with the judgment of God. the Exalted and Glorified.

وَحَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا هِشَامٌ، قَالَ قَالَ أَبِي فَأُخْبِرْتُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ
" لَقَدْ حَكَمْتَ فِيهِمْ بِحُكْمِ اللَّهِ عَزَّ وَجَلَّ " .