The guidance and knowledge with which Allah has sent me are like abundant rain that fell on some ground

The Prophet (may Allah's peace and blessings be upon him), expressing amazement, likened the one who benefits from what he brought—of guidance and the path that leads to the ultimate goal—and from religious knowledge to a land upon which abundant rain falls. This land, in turn, is of three types: The first type: a pure and fertile land that absorbs the rainwater, causing abundant vegetation—both fresh and dry—to grow, from which people benefit. The second type: land that holds water but does not grow vegetation. It retains the water, allowing people to benefit from it—drinking from it, watering their animals, and irrigating their crops. And the third type: a flat, smooth land that neither retains water nor grows any vegetation. It neither benefits itself from the rainwater, nor does it benefit others. Likewise are those who hear what the Prophet (may Allah's peace and blessings be upon him) was sent with—of knowledge and guidance. The first type: the scholar who understands the religion of Allah, acts upon his knowledge, and teaches it to others. He is like the fertile land that absorbs the water, benefiting itself and causing the growth of the plantation, and thereby benefiting others. The second type: the one who memorizes and preserves knowledge but does not have a deep understanding or the ability to derive rulings. He collects knowledge and spends his time doing so, but he either does not act upon its supererogatory aspects or does not comprehend what he has gathered. He is like a tool for others— benefiting them—and is similar to land that holds water, from which people benefit. The third type: the one who hears knowledge but neither preserves it, nor acts upon it, nor conveys it to others. He is like a barren or smooth land that has no vegetation, neither absorbing water nor allowing others to benefit from it.