Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:16440ʿAbdān b. Aḥmad > Zayd b. al-Ḥarīsh > Sufyān > Ayyūb b. Mūsá > Muḥammad b. Yaḥyá b. Ḥabbān > Sulaymān b. Muḥammad b. Kaʿb > ʿUmar Saʾal Kaʿb > Ay Shayʾ Āftadá Kaʿb Ḥīn Ḥalaq Raʾsah

[Machine] What did Ka'b sacrifice when he shaved his head? He said, "He slaughtered a cow."  

الطبراني:١٦٤٤٠حَدَّثَنَا عَبْدَانُ بْنُ أَحْمَدَ ثنا زَيْدُ بْنُ الْحَرِيشِ ثنا سُفْيَانُ عَنْ أَيُّوبَ بْنِ مُوسَى عَنْ مُحَمَّدِ بْنِ يَحْيَى بْنِ حَبَّانَ عَنْ سُلَيْمَانَ بْنِ مُحَمَّدِ بْنِ كَعْبٍ أَنَّ عُمَرَ سَأَلَ كَعْبًا فَقَالَ

أَيَّ شَيْءِ افْتَدَى كَعْبٌ حِينَ حَلَقَ رَأْسَهُ؟ قَالَ «ذَبَحَ بَقَرَةً»