It was narrated that ‘Umar bin Sa"d (رضي الله عنه) said:

I needed something from Abu Sa"d, and Abu Hayyan told us that Mujammi" said: “"Umar bin Sa"d needed something from me.” So he said something before stating his need to me, that was similar to what people say before stating their needs, but it was something with which he was not familiar. When he finished, he said: “O my son, have you finished speaking?” He said: “Yes.” He said: “You have never been less likely to get what you need and I have never been less interested in you since I heard these words of yours. I heard the Messenger of Allah (ﷺ) say: “There will be people who will earn a living by means of their tongues as cattle eat from the ground.”