Jami` at-Tirmidhi Book 44, Hadith 9
that the Messenger of Allah (ﷺ) said: "Indeed there is a tree that does not shed its foilage, and it is is similar to the believer. Can any of you tell me what it is?" 'Abdullah said: "The people started thinking about the trees of the desert. And it occurred to me that it may be the date-palm." Then the Prophet (ﷺ) said: "It is the date-palm." But I was shy - meaning to say anything." 'Abdullah said: "So I informed 'Umar about what I had thought of, and he said: 'If you had said it, that would be more beloved to me than this or that.'"
that the Messenger of Allah (ﷺ) said: "The parable of the believer is like the plant; the wind does not stop causing it to sway, and the believer does not stop suffering trials. The parable of the hypocrite is that of a cedar tree, it does not give in until it is cut down."
that the Messenger of Allah (ﷺ) said: "Do you think that if there was a river by the gate of one of you, and he bathed in it five times each day that there would remain any filth on him?" They said: "No filth would stay on him." He said: "That is the parable of the five prayers, Allah wipes out the sins with them."