Sahih Muslim Book - 15, Hadith - 3159

وَحَدَّثَنَا عَلِىُّ بْنُ خَشْرَمٍ أَخْبَرَنَا عِيسَى عَنِ ابْنِ جُرَيْجٍ قَالَ سَمِعْتُ ابْنَ شِهَابٍ يَقُولُ حَدَّثَنِى عِيسَى بْنُ طَلْحَةَ حَدَّثَنِى عَبْدُ اللَّهِ بْنُ عَمْرِو بْنِ الْعَاصِ أَنَّ النَّبِىَّ -صلى الله عليه وسلم- بَيْنَا هُوَ يَخْطُبُ يَوْمَ النَّحْرِ فَقَامَ إِلَيْهِ رَجُلٌ فَقَالَ مَا كُنْتُ أَحْسِبُ يَا رَسُولَ اللَّهِ أَنَّ كَذَا وَكَذَا قَبْلَ كَذَا وَكَذَا ثُمَّ جَاءَ آخَرُ فَقَالَ يَا رَسُولَ اللَّهِ كُنْتُ أَحْسِبُ أَنَّ كَذَا قَبْلَ كَذَا وَكَذَا لِهَؤُلاَءِ الثَّلاَثِ قَالَ « افْعَلْ وَلاَ حَرَجَ ».

Abdullah bin Amr bin Al-As narrated that while the Prophet (SAW) was delivering the Khutbah on the Day of Sacrifice, a man stood up and said: “I did not know, O Messenger of Allah (SAW), that such-and-such comes before such-and-such.” Then another came and said: “O Messenger of Allah (SAW), I thought that such-and-such came before such-and-such” - referring to these three (stoning, sacrificing and shaving). He said: ‘’Do it and it doesn’t matter.”