If the mufti is not certain of the answer, is he permitted to say, “Ask someone else,” and is this considered concealing knowledge?

The questioner: If the mufti is not certain of the answer, is he permitted to say, “Ask someone else,” and is this considered concealing knowledge?

The Shaykh : In any case, if he says, “Ask someone else,” he is safe, as long as he is not certain, what is obligatory for him?
The questioner : What is obligatory for him?

The Shaykh : What is obligatory for him? Is it obligatory for him to issue a fatwa on what he does not know?