عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ لِرَجُلٍ أُمِرْتُ بِيَوْمِ الْأَضْحَى جَعَلَهُ اللَّهُ عِيدًا لِهَذِهِ الْأُمَّةِ فَقَالَ الرَّجُلُ أَرَأَيْتَ إِنْ لَمْ أَجِدْ إِلَّا مَنِيحَةَ ابْنِي أَفَأُضَحِّي بِهَا قَالَ لَا وَلَكِنْ تَأْخُذُ مِنْ شَعْرِكَ وَتُقَلِّمُ أَظْفَارَكَ وَتَقُصُّ شَارِبَكَ وَتَحْلِقُ عَانَتَكَ فَذَلِكَ تَمَامُ أُضْحِيَّتِكَ عِنْدَ اللَّهِ
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to a man: I have been commanded regarding the Day of Sacrifice (Yawm al-Adha); Allah Almighty has made this day a festival for this Ummah. The man said: What is your opinion if I have only a goat belonging to my son, should I sacrifice it? The Prophet (peace and blessings be upon him) said: No, rather on the day of sacrifice, cut your hair, trim your nails, shorten your mustache, and shave the hair below the navel; this act will be considered a complete sacrifice for you in the sight of Allah Almighty.