Abu Uthman (may Allah have mercy on him) said: Sayyiduna Salman al-Farisi (may Allah be pleased with him) led us in a prayer, then he stood up and went to the branch of a dry tree and shook it, and its leaves fell. Then he said: "Do you know why I did this?" The people said: No. He said: "The Messenger of Allah (peace and blessings be upon him) led us in a prayer, then he stood up and went to the branch of a dry tree and shook it, and its leaves fell. Then he said: 'When a servant performs ablution and performs it well, then prays and prays well, his sins fall away just as the leaves of this tree fall.'"
Imam al-Tabarani (may Allah have mercy on him) said: This wording is that of Abdan's narration.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6127