When was the first decree of retaliation given?

Dear Brother / Sister,

During the expedition of Taif, they brought the Prophet a man from Sons of Lays. He had killed someone from Huzayls unjustly.

Both parties expressed their claims and defended themselves in the presence of the Prophet. In the end, the Prophet decreed that the man be killed in return for the man that he killed. The man was executed. It was the first feud that ended in retaliation in Islam. (Ibn Hisham, Sirah, Vol. 4, p. 125; Tabari, ibid, Vol. 3, p. 133.)

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