English Translation of Hadith
Hazrat Masruq (May Allah be pleased with him) said: We visited `Abdullah bin Masud (May Allah be pleased with him) and he said to us: O people! He who has the knowledge of any matter may convey it to the others. And he who has no knowledge, thereof, should say: "Allahu a’lam (Allah knows better).” It is a part and parcel of knowledge that a man who has no knowledge of a matter should say: "Allah knows better.” Allah said to His Prophet [SAWW](PBUH): "Say (O Muhammad [SAWW](PBUH)): `No wage do I ask of you for this (the Qur’an), nor am I one of the Mutakallifun (those who pretend and fabricate things which do not exist).”’ (38:86)
[Al-Bukhari Book 06, Chapter 60, Hadith # 333].
Lesson : as mentioned above in Surah Luqman Ayat 34. “No person knows what he will earn tomorrow, and no person knows in what land he will die. Verily, Allah is All Knower, All Aware (of things)” If one does not know about something, he should not say anything about it by way of conjecture, speculation and guesswork because this is also pretension which is forbidden. When religious scholars are asked about anything which they do not know, they should confess their ignorance. Such a confession is also a mark of scholarship. In other words, they should abstain from giving verdict about any matter without making a thorough study and research on it.