Umar ibn al-Khattab named a bukhti camel for sacrifice (at hajj). He was offered three hundred dinars for it (as its price). He came to the Prophet ﷺ and said: Messenger of Allah, I named a bukhti camel for sacrifice and I was offered for it three hundred dinars. May I sell it and purchase another one for its price? No, sacrifice it. Abu Dawud said: This was due to the fact that 'Umar had made an incision in hump.  

أَهْدَى عُمَرُ بْنُ الْخَطَّابِ نَجِيبًا فَأُعْطِيَ بِهَا ثَلاَثَمِائَةِ دِينَارٍ فَأَتَى النَّبِيَّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ إِنِّي أَهْدَيْتُ نَجِيبًا فَأُعْطِيتُ بِهَا ثَلاَثَمِائَةِ دِينَارٍ أَفَأَبِيعُهَا وَأَشْتَرِي بِثَمَنِهَا بُدْنًا قَالَ لاَ انْحَرْهَا إِيَّاهَا  

[Machine] Umar ibn Al-Khattab presented a camel as a gift and was given three hundred dinars for it. He then went to the Messenger of Allah ﷺ and said, "O Messenger of Allah, I have been given three hundred dinars for the camel that I presented as a gift. Should I slaughter it or should I buy a different camel with its price?" The Prophet ﷺ replied, "No, rather slaughter it."  

أَهْدَى عُمَرُ بْنُ الْخَطَّابِ بُخْتِيَّةً أُعْطِيَ بِهَا ثَلَاثَ مِائَةِ دِينَارٍ فَأَتَى رَسُولَ اللهِ ﷺ فَقَالَ يَا رَسُولَ اللهِ أَهْدَيْتُ بُخْتِيَّةً لِي أُعْطِيتُ بِهَا ثَلَاثَ مِائَةِ دِينَارٍ فَأَنْحَرُهَا أَوْ أَشْتَرِي بِثَمَنِهَا بُدْنًا قَالَ لَا وَلَكِنِ انْحَرْهَا إِيَّاهَا  

"عَنِ ابْنِ عُمَرَ: أَنَّ عُمَرَ أُهْدِى نَجِيبَةً (*) لَهُ فَأُعْطِىَ بِهَا ثَلَثُمِائةَ دِيَنَار، فَأَتَىَ عُمَرُ النَّبِىَّ ﷺ فَقَالَ: يَا نَبِىَّ اللهِ! أُهْدِيتُ نَجيبَةً لِى أُعْطِيتُ بِهَا ثَلَثُمِائَةَ دِينَارٍ فَأَبِيُعهَا وَأَشْتَرِى بَثَمَنِهَا بُدْنًا فَأَنْحَرُهَا؟ قَالَ: لاَ، انْحَرْهَا إِيَّاهَا".