It is narrated from Muhammad bin Talhah (may Allah be pleased with him) that a man was wounded on his leg by a horn. He came to the Prophet (peace and blessings of Allah be upon him) and said, "I want retribution (qisas)." The Prophet (peace be upon him) said, "Wait a little." Then he came again, and the Prophet (peace be upon him) again said, "Be patient for a while." He came again, and the Prophet (peace be upon him) said, "Wait a little." Then he came and made the same demand, so the Messenger of Allah (peace be upon him) allowed him to take retribution. The leg of the one from whom retribution was taken became fine, but the leg of the first man became paralyzed. He said, "O Messenger of Allah! His leg has become fine, but mine has become paralyzed." The Prophet (peace be upon him) said, "I told you to wait a little. Now there is nothing for you (you have taken retribution; if you had been patient, you would have received half the blood money)."
Hadith Referenceالسنن المأثورة / باب عقل الجنين / 599
Hadith Takhrijالسنن الکبری للبیہقی: 66/8، مصنف عبدالرزاق: 453,452/9، رقم : 17987,17986، سنن دار قطنی : 90,89/3، رجاله ثقات لكنه مرسل۔