Abu Huraira reported God’s messenger as saying, “If anyone is
given a legal decision ignorantly, the sin rests on the one who gave it;
and if anyone advises his brother, knowing that right guidance lies in
another direction, he has deceived him.” Abu Dawud transmitted it.
Abu Huraira reported God’s messenger as saying, "Learn the
things which are made obligatory and the Qur’an, and teach them to
people, for I shall die.” Tirmidhi transmitted it.
‘Auf b. Malik al-Ashja‘i reported God’s messenger as saying, "Only
a ruler, or one put in charge, or one who is presumptuous gives instruction."*
Abu Dawud transmitted it, and Darimi transmitted it from ' Amr b. Shu'aib from his father from his grandfather. A version has, "Or a hypocrite” instead of "one who is presumptuous”.
*The word used here is yaqussu, which may be translated as given above, but which may also
be translated as “inflicts punishment.”