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1702
“I (Masruq) said, ‘‘We visited Abdullah the son of Mas'ud and he told us, ‘Whosoever has knowledge of a matter may talk about it, but whosoever has no knowledge of it should say, 'Allah knows best.' It is part of knowledge that a person who has no knowledge of a matter should say, 'Allah knows best.' Allah said to His Prophet, praise and peace be upon him, 'Say: For this I ask of you no wage. and I am not of those who take things upon themselves.’” 38.86.
Bukhari with a chain up to Masruq who related that the Messenger of Allah, praise and peace be upon him, said this.