Sayyiduna Umar (may Allah be pleased with him) said: By Allah! If one of you strikes his brother with something like akilat al-lahm (a sharpened stick) and then thinks that I will not take retaliation from him, I will certainly take retaliation from him.
Abu Ubayd said: This hadith shows that there is retaliation even if the killing is done with something other than iron, when such a thing is of the kind that kills.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15994