Hadith no. 2051 (below) is a repeat. Read it here.
Volume 3, Book 40, Number 554 :
Narrated by Sahl bin Sad (radiallaahu `anhu)
Once a tumbler (full of milk or water) was brought to Allah’s Apostle (sallallaahu `alayhi wasallam) who drank from it, while on his right side there was sitting a boy who was the youngest of those who were present, and on his left side there were old men. The Prophet (sallallaahu `alayhi wasallam) asked, “O boy ! Do you allow me to give (the drink) to the elder people (first)?” The boy said, “I will not prefer anybody to have my share from you, O Allah’s Apostle (sallallaahu `alayhi wasallam)!” So, he gave it to the boy.
Volume 3, Book 40, Number 555 :
Narrated by Abu Huraira (radiallaahu `anhu)
The Prophet (sallallaahu `alayhi wasallam) said, “By Him in Whose Hands my soul is, I will drive some people out from my (sacred) Fount on the Day of Resurrection as strange camels are expelled from a private trough.”
Who are the ones who will drink and who are the ones who will be pushed away?
The Prophet (peace and blessings of Allaah be upon him) has answered this question clearly in such a way that no one has any excuse. Muslim narrated in his Saheeh (367) from Abu Hurayrah that the Messenger of Allaah (peace and blessings of Allaah be upon him) came to the graveyard and said: “Peace be upon you, O habitation of believing people. We will join you soon, if Allaah wills. Would that we had seen our brothers.” They said, “Are we not your brothers, O Messenger of Allaah?” He said: “You are my companions. Our brothers are those who have not yet come.” They said: “How will you recognize those among your ummah who have not yet come, O Messenger of Allaah?” He said: “If a man has a horse with a white blaze and white feet among horses that are all black, don’t you think that he will recognize his horse?” They said: “Of course, O Messenger of Allaah.” He said: “They will come with white foreheads and white hands and feet because of wudoo’. I will have reached the Cistern ahead of them and men will be driven away from my Cistern as stray camels are driven away. (I will say), ‘Let them come,’ and it will said to me, ‘They changed after you were gone,’ so I will say, ‘Away with them!’”
In al-Bukhaari (6528) and Muslim (4243) it is narrated that Abu Haazim said: I heard Sahl say: I heard the Prophet (peace and blessings of Allaah be upon him) say: “I will reach the Cistern ahead of you. Whoever comes to it will drink and whoever drinks from it will never thirst again. Some people will come to me whom I will recognize and they will recognize me, but then a barrier will be placed between me and them.” Abu Haazim said: al-Nu’maan ibn Abi ‘Ayyaash heard me narrating this hadeeth and said: “Is that how you heard Sahl say it?” I said, “Yes.” He said: “I bear witness that I heard Abu Sa’eed al-Khudri add: and he [meaning the Prophet (peace and blessings of Allaah be upon him)] said: ‘They are from me.” And it will be said; “You do not know what they did after you were gone.” And I will say, “Away with those who changed after I was gone!”’”
Al-Qurtubi (may Allaah have mercy on him) said: Our scholars (may Allaah have mercy on them) said:
Everyone who apostatizes from the religion of Allaah or who introduces innovations with which Allaah is not pleased and did not give permission for is one of those who will be driven away from the Cistern. Those who will be most forcibly driven away will be those who differed from the majority of Muslims and split from them, such as the Khaarijis and Raafidis of all stripes, and the Mu’tazilis and anyone who followed their ways. The same applies to the evildoers and oppressors who tried to extinguish the truth and kill its followers and humiliate them, and those who openly committed major sins and took the matter of sin lightly, and all those who followed deviant whims and desires and innovation.
Al-Tadhkirah by al-Qurtubi, 306.
So we must strive to follow the Prophet (peace and blessings of Allaah be upon him) and not go against him in any way, in the hope that Allaah will honour us by allowing us to drink from this blessed Cistern. Otherwise what regret can be greater than the regret of the one who is pushed away from before the Prophet (peace and blessings of Allaah be upon him) and suffers unbearable thirst but is not allowed to drink that cool water, then his loss is further compounded by the prayer of the Prophet (peace and blessings of Allaah be upon him) that he be driven far away? We seek refuge with Allaah. Imagine this torment – what if you were actually to experience it?
We ask Allaah to bless us and our Muslim brothers will guidance to follow the Sunnah and to avoid bid’ah (innovation) and sin. Ameen. Praise be to Allaah, the Lord of the Worlds.
Taken from IslamQA