I swear by Allah, Sahl had a misunderstanding about this tradition. The Messenger of Allah ﷺ wrote to the Jews: A slain man has been found amongnst you, so pay his bloodwit. They wrote (to him): Swearing by Allah fifty oaths, we neither killed him nor do we know his slayer. He said: Then the Messenger of Allah ﷺ himself paid his bloodwit which consisted of one hundred she-camels.
إِنَّ سَهْلاً وَاللَّهِ أَوْهَمَ الْحَدِيثَ إِنَّ رَسُولَ اللَّهِ ﷺ كَتَبَ إِلَى يَهُودَ أَنَّهُ قَدْ وُجِدَ بَيْنَ أَظْهُرِكُمْ قَتِيلٌ فَدُوهُ فَكَتَبُوا يَحْلِفُونَ بِاللَّهِ خَمْسِينَ يَمِينًا مَا قَتَلْنَاهُ وَلاَ عَلِمْنَا قَاتِلاً قَالَ فَوَدَاهُ رَسُولُ اللَّهِ ﷺ مِنْ عِنْدِهِ مِائَةَ نَاقَةٍ