Muhammad.com collection in 109 languages

Allah does not give learned men any knowledge until He takes
from them a covenant (as He took from the prophets) to make it
known, and not conceal it. The Holy Qur'an says, "Remember
when Allah took a covenant from the People of the Book, 'You
shall surely make it known to the people, and not conceal it.'"98
This tells us that we have a binding obligation to teach that which
we have learned. Allah tells us, "Call towards the ways of your
Lord with wisdom and good sermon."99 He also tells us, "And who
is better in speech than one who calls [people] to Allah and does
good and says: 'I am surely of those who are Muslims (inclined to
peace)?"'100
The Holy Qur'an teaches, "Ah! who is more unjust than those
who conceal the testimony they have from Allah? But Allah is not
unmindful of what you do."101 It also says, "Conceal not evidence;
for whoever conceals it, his heart is tainted with sin. And Allah
knows all that you do."102
The worst sin in society is cheating our fellow man because we
want to have some exclusive superiority over him, or because we