«كان يكره المسائل ويعيبها فإذا سأله أبو رزين أجابه وأعجبه»
It was the practice of the Prophet (peace and blessings be upon him):
"He (peace and blessings be upon him) disliked unnecessary questions and found fault with them, but when Abu Razin asked him, he would answer him, and he was pleased with what he said."
Hadith Referenceصحیح الجامع الصغیر / حرف الكاف / 5007