Alqama bin Waail reported,

A man who had killed another was brought to the Prophet ﷺ, and the Prophet ﷺ handed him over to the victim's heir to be executed.The Prophet ﷺ then said to those sitting with him, "Both the killer and the one killed will be in the Fire."A man went after the heir and informed him of what the Prophet ﷺ had said, and when he was told this, he released the killer.The narrator said, I saw him dragging his rope behind him as he was let go.I mentioned this to Habib, and he said, Saeed bin Ashwa narrated to me, mentioning that the Prophet ﷺ had ordered the man to pardon him.

Nasai 4733

Sahih

أخبرنا محمد بن معمر قال حدثنا يحيى بن حماد عن أبي عوانة عن إسمعيل بن سالم

عن علقمة بن وائل أن أباه حدثهم

أن النبي ﷺ أتي برجل قد قتل رجلا فدفعه إلى ولي المقتول يقتله فقال النبي ﷺ لجلسائه القاتل والمقتول في النار قال فاتبعه رجل فأخبره فلما أخبره تركه قال فلقد رأيته يجر نسعته حين تركه يذهب فذكرت ذلك لحبيب فقال حدثني سعيد بن أشوع قال وذكر أن النبي ﷺ أمر الرجل بالعفو

النسائي 4733صحيح
Contents
Reference
Commentary
Ayat
Collection
Sunan Nasai Sughra
Book
Sworn testimony
Chapter
Disagreement among narrators of the hadith of Alqama bin Waail regarding this
Numbering
Darussalam 4733
Nasai 4733