Sunan an-Nasa'i 1933

It was narrated that Abu Hurairah said:"A funeral passed by the Prophet and they praised (the deceased). The Prophet said: 'It is granted.' Then another funeral passed by and they criticized (the deceased). The Prophet said: 'It is granted.' They said: 'O Messenger of Allah, you said in both cases, 'It is granted?' The Prophet said: 'The angels are the witnesses of Allah in heaven, and you are the witnesses of Allah on Earth