Musannaf Ibn Abi Shaybah

Hazrat Abu Al-Ahwas narrates that Hazrat Abdullah bin Mas'ud (may Allah be pleased with him) said: When any of you wishes to make a request for a need, he should make a light request. He should not do such that he comes to a man and praises him to his face, but ignores him behind his back, because that man cannot withhold anything from him.