It was narrated from 'Amr bin Shu'aib, from this father, from his grandfather that the Messenger of Allah (ﷺ) said:
"Whoever kills deliberately, he will be handed over to the heirs of the victim. If they want, they may kill him, or if they want, they may accept the blood money, which is thirty Hiqqah, thirty Jadha'ah and forty Khalifah. This is the blood money for deliberate slaying. Whatever is settled by reconciliation belongs to them, and that is a binding covenant."
English reference: Vol. 3, Book 21, Hadith 2626
Arabic reference: Book 21, Hadith 2727