Narrated 'Ikrima: Ibn 'Abbas said: "Allah's Messenger ﷺ delivered a sermon on the Day of Nahr, and said, 'O people! (Tell me) what is the day today?' The people replied, 'It is the forbidden (sacred) day'. He asked again, 'What town is this?' They replied, 'It is the forbidden (Sacred) town'. He asked, 'Which month is this?' They replied, 'It is the forbidden (Sacred) month'. He said, 'No doubt! Your blood, your properties, and your honor are sacred to one another like the sanctity of this day of yours, in this (sacred) town (Mecca) of yours, in this month of yours'. The Prophet ﷺ repeated his statement again and again. After that he raised his head and said, 'O Allah! Haven't conveyed (Your Message) to them'. Haven't I conveyed Your Message to them?' " Ibn 'Abbas added, "By Him in Whose Hand my soul is, the following was his will (Prophet's will) to his followers:--It is incumbent upon those who are present to convey this information to those who are absent Beware don't renegade (as) disbelievers (turn into infidels) after me, Striking the necks (cutting the throats) of one another'. "
The Prophet ﷺ also warned his followers against turning into infidels after him by striking each other's necks - meaning killing one another without any valid reason - which is strictly forbidden in Islam. He wanted his followers to remain united even after his death so they can continue spreading peace throughout the world with love for one another instead of hatred towards each other based on differences in beliefs or opinions.
This hadith teaches us many values such as respect for life, property and honor; unity among Muslims; peace over violence; love over hatred; justice over injustice; mercy over cruelty etc., which are essential for living a peaceful life both here on earth as well as in hereafter according to Islamic teachings.
