Abu Bakrah reported: The Prophet, peace and blessings be upon him, said during his last pilgrimage, “What is the day today?” We kept quiet, thinking he might give the day another name. The Prophet said, “Is it not the day of sacrificing?” We said yes. The Prophet said, “Which month is this?” We again kept quiet, thinking he might give it another name. The Prophet said, “Is it not the month of Dhul Hijja?” We said yes. The Prophet said, “Verily,
your lives, your property, and your honor are sacred to one another
like the sanctity of this day of yours, in this month of yours, in this
city of yours. Let one present inform those who are absent; perhaps one
present will inform another who understands better than him.” [Source: Ṣaḥīḥ al-Bukhārī 67. Grade: Sahih (authentic) according to Al-Bukhari]
عَنْ أَبِي بَكْرَةَ قال قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي حَجَّةِ الْوَدَاعِ أَيُّ يَوْمٍ هَذَا فَسَكَتْنَا حَتَّى ظَنَنَّا أَنَّهُ سَيُسَمِّيهِ سِوَى اسْمِهِ قَالَ أَلَيْسَ يَوْمَ النَّحْرِ قُلْنَا بَلَى قَالَ فَأَيُّ شَهْرٍ هَذَا فَسَكَتْنَا حَتَّى ظَنَنَّا أَنَّهُ سَيُسَمِّيهِ بِغَيْرِ اسْمِهِ فَقَالَ أَلَيْسَ بِذِي الْحِجَّةِ قُلْنَا بَلَى قَالَ فَإِنَّ
دِمَاءَكُمْ وَأَمْوَالَكُمْ وَأَعْرَاضَكُمْ بَيْنَكُمْ حَرَامٌ
كَحُرْمَةِ يَوْمِكُمْ هَذَا فِي شَهْرِكُمْ هَذَا فِي بَلَدِكُمْ هَذَا
لِيُبَلِّغ الشَّاهِدُ الْغَائِبَ فَإِنَّ الشَّاهِدَ عَسَى أَنْ يُبَلِّغَ
مَنْ هُوَ أَوْعَى لَهُ مِنْهُ
[67 صحيح البخاري كتاب العلم باب قول النبي صلى الله عليه وسلم رب مبلغ أوعى من سامع]