It is reported that ‘Abdullāh b. Mas’ūd – Allāh be pleased with him – said:

By Allāh, he who gives people verdicts (fatwā) for every question they ask him is crazy (majnūn).

Ibn Battah Al-‘Ukbarī, Ibtāl Al-Hiyal article 81, et al.

Imām Ibn Battah (d. 304H) laments:

So here is Ibn Mas’ūd, swearing by Allāh that a person who gives people verdicts for every question they ask him is mad. And [now] if a person swore, he would not be breaking his oath, and if a person said, he would be speaking the truth: that most of the muftis of our time are mad. For you will hardly find a man who is asked about an issue pausing to consider carefully before answering, nor fearing Allāh and bringing to mind that Allāh is watching him, and fearing that He will say to him: What is the basis of your answer? Rather, most of them worry that it will be said: so-and-so was asked a question and he had no answer…