Abu khaythama narrated to us, (saying): Abdur-Rahmaan Ibn Mahdee narrated to us, (saying): Moosaa Ibn Ulayya narrated to us from his father who said: “Whenever a man asked Yazeed Bin Thaabit about something, he said: “Is this for Allaah’s sake?” If he (the questioner) said: “yes”, he (Yazeed) would speak; and if not he would not speak.

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Source: kitaabul ilm of Abu khaythama with the checking of Imaam Albaanee. Page: 20. Narration 75