The Prophet (s.a.w) said: "By Allah, if Allah guides a man (to Islam) through you, it is much better for you than being blessed with the best pleasures of this world." [Bukhari]

Furthermore, the Prophet (s.a.w) didn't even leave an excuse for an indolent or negligent person by asserting: "Convey (my teachings) to the people even if it were a single sentence." [Bukhari, Tirmidhee & Ahmad]