It is reported that Al-Fuḍayl b. ʿAyyāḍ – Allāh have mercy on him – said:

The true faqīh (scholar) is the one who the fear of Allāh makes talk and the fear of Allāh makes silent. If he speaks it is by the Book and the Sunnah, and if he is silent, it is by the Book and the Sunnah. And if something is confusing to him and unclear, he withholds judgement and refers it back to whoever knows about it.

Ibn Baṭṭah, Ibṭāl Al-Ḥiyal p18, 19.