Anas (May Allah be pleased with him) reported: Some Companions happened to pass by a funeral procession (bier) and they praised him (the deceased). The Prophet ﷺ said, "He will certainly enter it". Then they passed by another funeral procession and they spoke ill of the deceased. The Prophet ﷺ said, "He will certainly enter it"'.Umar bin Al-Khattab (May Allah be pleased with him) said: "(O Messenger of Allah,) what do you mean by 'He will certainly enter it?'' He ﷺ replied, "You praised the first person, so he will enter Jannah; and you spoke ill of the second person, so he will enter Hell. You are Allah's witnesses on earth". Al-Bukhari and Muslim.