Don’t Conceal Your Knowledge!

The Holy Prophet [s.a] said: ‘Someone who possesses knowledge on a subject but conceals it when he is asked will be bridled with reins of fire.’ (Therefore, if a person possesses information that would help a bewildered person and improve his situation but he remains silent, he has surely committed a great sin.)

Source: Al -'Ithna-'Ashariyyah, p. 11

Other links:

The characteristics of Real Follower of Ahlul-Bayt