" Saalih Ibn Abdillah went to his Father (Imaam Ahmed) and said: A man wants to come to you ( visit)
He said (Imaam Ahmed): What is his name?
He said: Dawood
He said: From where
He said: From Asbahaan
..... Imaam Ahmed kept on investigating until he realised (ie. who he was)
so he said (Imaam Ahmed): Muhammed ibn Yahya An-Naysaboori has already written to me about him and informed me that he claims that the Quraan is created, so don't let him come close to me.
He said (His son): But Oh father he negates this.
Imaam Ahmed said: Muhammed Ibn Yahya is more trustworthy than him, so dont let him come to me.