Allah Ta'ala says, And glorify Him in the morning and evening. It is He who gives mercy to you and His angels (asks forgiveness for you), so that He brings you out of darkness into light (brightness). And He is Most Merciful to those who believe (QS. Al-Ahzab: 42-43)
Whoever conveys a knowledge and someone practices it, even though the person who conveyed it is no longer alive, he will still receive a reward (HR. Al-Bukhari)