Abu Musa Ashari reported,

The Messenger of Allah ﷺ said, "The guidance and knowledge with which Allah has sent me are like abundant rain that falls upon the earth. Part of the ground was receptive and absorbed the water, bringing forth abundant pasture and grass. Another part was hard and held the water, and Allah benefited people through it, so they drank and gave drink and irrigated and planted. But the rain also fell on another portion, which was nothing but barren flats that neither hold water nor bring forth pasture. That is the likeness of the one who gains understanding in the religion of Allah , so that what Allah sent me with benefits him, and he learns and teaches, and the likeness of the one who pays it no attention at all and does not accept the guidance of Allah with which I was sent."

وقال رسول الله ﷺ إن مثل ما بعثني الله عز وجل به من الهدى والعلم كمثل غيث أصاب الأرض فكانت منه طائفة قبلت فأنبتت الكلأ والعشب الكثير وكانت منها أجادب أمسكت الماء فنفع الله عز وجل بها ناسا فشربوا فرعوا وسقوا وزرعوا وأسقوا وأصابت طائفة منها أخرى إنما هي قيعان لا تمسك ماء ولا تنبت كلأ فذلك مثل من فقه في دين الله عز وجل ونفعه الله عز وجل بما بعثني به ونفع به فعلم وعلم ومثل من لم يرفع بذلك رأسا ولم يقبل هدى الله عز وجل الذي أرسلت به