110 Hadith Qudsi, Chapter: 110 Ahadith Qudsi (Sacred Hadith)

I heard Allah's Messenger (PBUH) saying: There were two fraternal persons among the Children of Israel. One of them was engrossed in committing sins while the other was devoted to worship. The devotee used to see his fellow committing sin and advise him: Desist from doing so. One day when he found his fellow committing sin. He said to him: Avoid it. His fellow said: Leave me alone. Have you been sent out as a vigilant on me. The devotee said: By Allah, He will neither forgive you nor admit you to Paradise. When they died, they were gathered before the Lord of the worlds. Allah asked the devotee: Were you assured of knowing Me or were you having power over what was in My Hands? Then He said to the sinner: Go and enter Paradise by My Mercy; and ordered the angels about the devotee: Lead him to Hell. (This Hadith is sound and reported by Abu Da'ud in his Sunan). After narrating the Hadith, Abu Huraira commented: By Him in Whose Hand my soul is: One word spoken by the devotee ruined his good deeds in the world as well as in the Hereafter. *This Hadith signifies that no body should claim whether one would enter Paradise or step into Hell because the verdict here, is for Allah Who is All-Omnipotent over every thing, will decide whatever He likes. A righteous person is required to do good and avoid evil for the sake of Allah only and advise others with the same. He should not say such words as to challenge the authority of Allah. Moreover, it is wrong to feel desperate from the Mercy of Allah.*