Sayyiduna Abdullah bin Wafid (may Allah be pleased with him) narrates that the practice of swearing oaths concerning a killing existed in the blessed time of the Prophet (peace and blessings be upon him) as well.
Al-Tabarani recorded it in al-Mu'jam al-Awsat via Abd al-Malik bin Sariyah al-Akki, from Sayyiduna Abdullah bin Wafid (may Allah be pleased with him), and I do not know him. The rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الديات / 10738
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه المعجم الأوسط للطبراني برقم: 6515»