Abu Musa (May Allah be pleased with him) reported

The Messenger of Allah (ﷺ) said, "The guidance and knowledge with which Allah has sent me are like abundant rain which fell on a land. A fertile part of it absorbed the water and brought forth profuse herbage and pasture; and solid ground patches which retained the water by which Allah has benefited people, who drank from it, irrigated their crops and sowed their seeds; and another sandy plane which could neither retain the water nor produce herbage. Such is the similitude of the person who becomes well-versed in the religion of Allah and receives benefit from the Message entrusted to me by Allah, so he himself has learned and taught it to others; such is also the similitude of the person who has stubbornly and ignorantly rejected Allah's Guidance with which I have been sent."

[Al-Bukhari and Muslim]