Hazrat Sahl bin Sa'd reports that the Holy Prophet said: "I will be the first person to reach the Fountain of Kausar. Whoever passes near me will receive the water of Kausar. He who drinks it once and will never feel thirsty. Some people will come to me there, I shall know them and they me, but meanwhile an impediment will be made between me and them and they will be stopped I'll say "They're my companions". But I'll be told: "You don't know what they did after you." Then I too will say: "Destruction and distance be for that man who changed his behaviour and method after me!"
Hence the holy Companions used to feel great anxiety that while in the world they enjoyed the good fortune of having his comradeship and company, in the next world they might be pushed out from his company due to their misdeeds. As such, once Hazrat Khabbab bin Arat fell ill. Some holy Companions came to inquire about his health and said: "0 Abu Abd Allah! Congratulations that you will meet your brethren (the holy Companions and the Holy Prophet () tomorrow." The narrator of this incident, Hazrat Tariq bin Shahab, says that hearing these words Hazrat Khabbab wept and said: "I was feeling no consternation for a long time but you have (today) revived the memory of a people and you have called them my brethren, but they were such august men that they all earned their recompense and went away, whereas I am afraid lest the recompense of the deeds you mention should be this which was given to us (worldly expansion) after their departure."
If these holy men ever happened to hear from the Holy Prophet a single sentence of displeasure at any decision, they would take it upon themselves and would weep at it. Accordingly, once Hazrat Abd al-Raham ibn Awf went to Hazrat Umm Salmah and said: "Dear Mother, I'm afraid lest my wealth should ruin me; I'm very affluent among the Quraishites." She said: "0 my son! Spend your wealth for I have, heard it from the Holy Prophet that he used to say: "Amongst my Companions there would be some who would not be able to see me after I go away leaving them behind." Then Hazrat Abd al-Rahman bin Awf went from there and met Hazrat Umar and narrated to him what Hazrat Umm Salmah had said.
Hearing this Hazrat Umar came to Hazrat Umm Salmah and asked her: "By Allah! Am I too amongst those people who would not have the good fortune to see him again"? She said: "No, 0 Umar! But besides you, I don't exempt anyone else."
This is a long narrative. We had only to state here that what severe comminations have been reported in the Quran and the Hadith for opposing the Holy Prophet and his orders and methods. Hearing these comminations the Companions used to cry and tremble as to what would be their condition on the Day of Judgment. Their whole life used to be an exemplary specimen of the Holy Prophet's holy life and yet they always used to feel concerned lest they might commit some lapse, because his statements in this regard are absolute.