The meaning of «So, avoid the filth of idols», forged statement and amusement in speech

I asked Ja’far bin Muhammed, peace be upon them both, about the saying of Allah, Exalted and Glorious is He: «So, avoid the filth of idols and forged statement» (22:30). He said: Filth from idols is chess, and forged…

I asked him about forged statement. He said: From it is the saying of a man to the one who sings: «You did well».